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olabusayo pushed a commit to branch main
in repository https://gitbox.apache.org/repos/asf/daffodil.git


The following commit(s) were added to refs/heads/main by this push:
     new ed70d60a4 Remove UDF module and migrate content to core module
ed70d60a4 is described below

commit ed70d60a4fe3abb049b387baa21db82ad77893a9
Author: olabusayoT <[email protected]>
AuthorDate: Mon Aug 11 17:07:24 2025 -0400

    Remove UDF module and migrate content to core module
    
    - delete `daffodil-udf` module
    - move UDF-related code and documentation to `daffodil-core`
    - update build definitions and dependencies
    - adjust tests, paths, and references to align with the migration
    - clean up redundant files and update documentation
    
    DAFFODIL-2994
---
 .sonar-project.properties                          |   2 +-
 DEVELOP.md                                         |   7 +-
 build.sbt                                          |  15 +-
 .../daffodil/api/udf/UserDefinedFunction.java      |   0
 .../api/udf/UserDefinedFunctionIdentification.java |   0
 .../api/udf/UserDefinedFunctionProvider.java       |   0
 .../UserDefinedFunctionFatalException.java         |   0
 .../UserDefinedFunctionProcessingError.java        |   0
 .../org/apache/daffodil/api/udf/package-info.java  | 147 +++++++++++++++
 .../annotations/StringFunctions/Compare.java       |   0
 .../badudfs/annotations/StringFunctions/FuncB.java |   0
 ...he.daffodil.api.udf.UserDefinedFunctionProvider |   0
 .../annotations/StringFunctions/Replace.java       |   0
 .../StringFunctions/StringFunctionsProvider.java   |   0
 .../badudfs/evaluate/StringFunctions/FuncA.java    |   0
 .../badudfs/evaluate/StringFunctions/FuncB.java    |   0
 .../badudfs/evaluate/StringFunctions/FuncC.java    |   0
 .../badudfs/evaluate/StringFunctions/FuncD.java    |   0
 .../badudfs/evaluate/StringFunctions/FuncE.java    |   0
 ...he.daffodil.api.udf.UserDefinedFunctionProvider |   0
 .../badudfs/evaluate/StringFunctions/Replace.java  |   0
 .../StringFunctions/StringFunctionsProvider.java   |   0
 .../functionclasses1/StringFunctions/FuncA.java    |   0
 ...he.daffodil.api.udf.UserDefinedFunctionProvider |   0
 .../functionclasses1/StringFunctions/Replace.java  |   0
 .../StringFunctions/StringFunctionsProvider.java   |   0
 .../functionclasses2/StringFunctions/FuncA.java    |   0
 ...he.daffodil.api.udf.UserDefinedFunctionProvider |   0
 .../functionclasses2/StringFunctions/Replace.java  |   0
 .../StringFunctions/StringFunctionsProvider.java   |   0
 .../org/badudfs/nonUDF/StringFunctions/FuncA.java  |   0
 ...he.daffodil.api.udf.UserDefinedFunctionProvider |   0
 .../badudfs/nonUDF/StringFunctions/Replace.java    |   0
 .../StringFunctions/StringFunctionsProvider.java   |   0
 .../jgoodudfs/example/StringFunctions/Compare.java |   0
 .../jgoodudfs/example/StringFunctions/Replace.java |   0
 .../StringFunctions/StringFunctionsProvider.java   |   0
 .../org/apache/daffodil/udf/genericUdfSchema.xsd   |   0
 ...he.daffodil.api.udf.UserDefinedFunctionProvider |   0
 ...he.daffodil.api.udf.UserDefinedFunctionProvider |   0
 ...he.daffodil.api.udf.UserDefinedFunctionProvider |   0
 ...he.daffodil.api.udf.UserDefinedFunctionProvider |   0
 .../StringFunctions/StringFunctionsProvider.scala  |   0
 ...he.daffodil.api.udf.UserDefinedFunctionProvider |   0
 .../StringFunctions/StringFunctionsProvider.scala  |   0
 ...he.daffodil.api.udf.UserDefinedFunctionProvider |   0
 .../StringFunctions/StringFunctionsProvider.scala  |   0
 ...he.daffodil.api.udf.UserDefinedFunctionProvider |   0
 .../StringFunctions/StringFunctionsProvider.scala  |   0
 ...he.daffodil.api.udf.UserDefinedFunctionProvider |   0
 .../StringFunctions/StringFunctionsProvider.scala  |   0
 ...he.daffodil.api.udf.UserDefinedFunctionProvider |   0
 .../StringFunctions/StringFunctionsProvider.scala  |   0
 .../IntegerFunctionsProvider.scala                 |   0
 .../StringFunctions/StringFunctionsProvider.scala  |   0
 .../SupportedTypesFunctionsProvider.scala          |   0
 daffodil-layers/README.md                          |  21 ---
 .../apache/daffodil/cliTest/TestCLIPlugins.scala   |   4 +-
 .../org/apache/daffodil/cliTest/TestCLIUdfs.scala  |  68 +++----
 daffodil-udf/README.md                             | 149 ---------------
 daffodil-udf/src/main/resources/META-INF/LICENSE   | 202 ---------------------
 daffodil-udf/src/main/resources/META-INF/NOTICE    |  10 -
 62 files changed, 190 insertions(+), 435 deletions(-)

diff --git a/.sonar-project.properties b/.sonar-project.properties
index 67ef3cf11..1ece3a3d1 100644
--- a/.sonar-project.properties
+++ b/.sonar-project.properties
@@ -14,7 +14,7 @@
 # limitations under the License.
 sonar.organization=apache
 sonar.projectKey=apache-daffodil
-sonar.modules=daffodil-cli,daffodil-codegen-c,daffodil-core,daffodil-macro-lib,daffodil-propgen,daffodil-schematron,daffodil-slf4j-logger,daffodil-tdml-lib,daffodil-tdml-processor,daffodil-test,daffodil-test-ibm1,daffodil-test-integration,daffodil-udf
+sonar.modules=daffodil-cli,daffodil-codegen-c,daffodil-core,daffodil-macro-lib,daffodil-propgen,daffodil-schematron,daffodil-slf4j-logger,daffodil-tdml-lib,daffodil-tdml-processor,daffodil-test,daffodil-test-ibm1,daffodil-test-integration
 sonar.sources=src/main
 sonar.tests=src/test
 sonar.c.file.suffixes=-
diff --git a/DEVELOP.md b/DEVELOP.md
index 81a110344..eb0062f23 100644
--- a/DEVELOP.md
+++ b/DEVELOP.md
@@ -227,7 +227,7 @@ daffodil/
 ├── daffodil-codegen-c/         - Contains Daffodil's C code generator
 ├── daffodil-macro-lib/         - Defines Daffodil's Scala 2.x macros
 ├── daffodil-propgen/           - Contains generators to generate more source 
code
-├── daffodil-core/              - Contains Daffodil's input/output/charsets, 
Scala parser, schema compiler, utilities, layers, unparsers and the API
+├── daffodil-core/              - Contains Daffodil's input/output/charsets, 
Scala parser, schema compiler, utilities, layers, udfs, unparsers and the API
 ├── daffodil-schematron/
 │   ├── README.md               - Explains how to validate with Schematron 
rules
 │   └── src/                    - Contains Daffodil's Schematron validator
@@ -235,9 +235,6 @@ daffodil/
 ├── daffodil-tdml-processor/    - Contains Daffodil's Scala & C TDML 
implementations
 ├── daffodil-test/              - Contains Daffodil's TDML tests
 ├── daffodil-test-ibm1/         - Contains more TDML tests from IBM & Tresys
-├── daffodil-udf/
-│   ├── README.md               - Explains how to implement user defined 
functions
-│   └── src/                    - Contains Daffodil's UDF interfaces
 ├── project/
 │   ├── Dependencies.scala      - Defines third party dependencies
 │   ├── Rat.scala               - Lists files to be ignored by license audit 
tool
@@ -273,7 +270,7 @@ Daffodil's API from Maven or sbt:
 
 <dependency>
   <groupId>org.apache.daffodil</groupId>
-  <artifactId>daffodil-core_3.3</artifactId>
+  <artifactId>daffodil-core_3</artifactId>
   <version>4.0.0</version>
 </dependency>
 ```
diff --git a/build.sbt b/build.sbt
index f3ce75145..8656a51b1 100644
--- a/build.sbt
+++ b/build.sbt
@@ -44,8 +44,7 @@ lazy val daffodil = project
     testIBM1,
     // testIntegration, // integration tests must be run manually
     testStdLayout,
-    tutorials,
-    udf
+    tutorials
   )
   .settings(
     commonSettings,
@@ -69,7 +68,6 @@ lazy val slf4jLogger = Project("daffodil-slf4j-logger", 
file("daffodil-slf4j-log
 
 lazy val core = Project("daffodil-core", file("daffodil-core"))
   .dependsOn(
-    udf,
     macroLib % "compile-internal, test-internal",
     slf4jLogger % "test"
   )
@@ -132,17 +130,13 @@ lazy val cli = Project("daffodil-cli", 
file("daffodil-cli"))
   .settings(libraryDependencies ++= Dependencies.cli)
   .settings(libraryDependencies ++= Dependencies.exi)
 
-lazy val udf = Project("daffodil-udf", file("daffodil-udf"))
-  .dependsOn(slf4jLogger % "test")
-  .settings(commonSettings)
-
 lazy val schematron = Project("daffodil-schematron", 
file("daffodil-schematron"))
   .dependsOn(core, core % Test, slf4jLogger % "test")
   .settings(commonSettings)
   .settings(libraryDependencies ++= Dependencies.schematron)
 
 lazy val testDaf = Project("daffodil-test", file("daffodil-test"))
-  .dependsOn(tdmlJunit % "test", codeGenC % "test->test", udf % "test->test")
+  .dependsOn(tdmlJunit % "test", codeGenC % "test->test", core % "test->test")
   .settings(commonSettings, nopublish)
 //
 // Uncomment the following line to run these tests
@@ -161,7 +155,7 @@ lazy val testIBM1 = Project("daffodil-test-ibm1", 
file("daffodil-test-ibm1"))
 
 lazy val testIntegration =
   Project("daffodil-test-integration", file("daffodil-test-integration"))
-    .dependsOn(cli % "test->test", udf % "test->test", testDaf % "test->test")
+    .dependsOn(cli % "test->test", core % "test->test", testDaf % "test->test")
     .settings(commonSettings, nopublish)
     .settings(
       // CLI integration tests fork a new process which requires extra memory, 
so these should
@@ -411,12 +405,11 @@ lazy val ratSettings = Seq(
 lazy val unidocSettings =
   Seq(
     ScalaUnidoc / unidoc / unidocAllClasspaths := Seq(
-      (udf / Compile / fullClasspath).value,
       (core / Compile / fullClasspath).value,
       (Compile / fullClasspath).value
     ),
     ScalaUnidoc / unidoc / unidocProjectFilter :=
-      inProjects(udf, core),
+      inProjects(core),
     ScalaUnidoc / unidoc / javacOptions := Seq(
       "-windowtitle",
       "Apache Daffodil " + version.value + " API",
diff --git 
a/daffodil-udf/src/main/java/org/apache/daffodil/api/udf/UserDefinedFunction.java
 
b/daffodil-core/src/main/java/org/apache/daffodil/api/udf/UserDefinedFunction.java
similarity index 100%
rename from 
daffodil-udf/src/main/java/org/apache/daffodil/api/udf/UserDefinedFunction.java
rename to 
daffodil-core/src/main/java/org/apache/daffodil/api/udf/UserDefinedFunction.java
diff --git 
a/daffodil-udf/src/main/java/org/apache/daffodil/api/udf/UserDefinedFunctionIdentification.java
 
b/daffodil-core/src/main/java/org/apache/daffodil/api/udf/UserDefinedFunctionIdentification.java
similarity index 100%
rename from 
daffodil-udf/src/main/java/org/apache/daffodil/api/udf/UserDefinedFunctionIdentification.java
rename to 
daffodil-core/src/main/java/org/apache/daffodil/api/udf/UserDefinedFunctionIdentification.java
diff --git 
a/daffodil-udf/src/main/java/org/apache/daffodil/api/udf/UserDefinedFunctionProvider.java
 
b/daffodil-core/src/main/java/org/apache/daffodil/api/udf/UserDefinedFunctionProvider.java
similarity index 100%
rename from 
daffodil-udf/src/main/java/org/apache/daffodil/api/udf/UserDefinedFunctionProvider.java
rename to 
daffodil-core/src/main/java/org/apache/daffodil/api/udf/UserDefinedFunctionProvider.java
diff --git 
a/daffodil-udf/src/main/java/org/apache/daffodil/api/udf/exceptions/UserDefinedFunctionFatalException.java
 
b/daffodil-core/src/main/java/org/apache/daffodil/api/udf/exceptions/UserDefinedFunctionFatalException.java
similarity index 100%
rename from 
daffodil-udf/src/main/java/org/apache/daffodil/api/udf/exceptions/UserDefinedFunctionFatalException.java
rename to 
daffodil-core/src/main/java/org/apache/daffodil/api/udf/exceptions/UserDefinedFunctionFatalException.java
diff --git 
a/daffodil-udf/src/main/java/org/apache/daffodil/api/udf/exceptions/UserDefinedFunctionProcessingError.java
 
b/daffodil-core/src/main/java/org/apache/daffodil/api/udf/exceptions/UserDefinedFunctionProcessingError.java
similarity index 100%
rename from 
daffodil-udf/src/main/java/org/apache/daffodil/api/udf/exceptions/UserDefinedFunctionProcessingError.java
rename to 
daffodil-core/src/main/java/org/apache/daffodil/api/udf/exceptions/UserDefinedFunctionProcessingError.java
diff --git 
a/daffodil-core/src/main/java/org/apache/daffodil/api/udf/package-info.java 
b/daffodil-core/src/main/java/org/apache/daffodil/api/udf/package-info.java
new file mode 100644
index 000000000..36d20ea5f
--- /dev/null
+++ b/daffodil-core/src/main/java/org/apache/daffodil/api/udf/package-info.java
@@ -0,0 +1,147 @@
+/*
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+the License.  You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+  */
+/**
+ * <h2>User Defined Functions</h2>
+ *
+ * <h3>Introduction</h3>
+ * <p>
+ * Apache Daffodil allows execution of Java/Scala external (user defined) 
functions in DFDL expressions.
+ * </p>
+ *
+ * <h3>Getting Started</h3>
+ * <p>
+ * Provide a JAR on the classpath (or Daffodil classpath) that contains at 
least two kinds of classes:
+ * a <em>provider</em> class and its associated user-defined function (UDF) 
class(es). All providers must be
+ * registered in the file
+ * {@code 
META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider}, 
regardless of how many
+ * providers or UDFs are included.
+ * </p>
+ *
+ * <h4>UDF Implementation</h4>
+ *
+ * <h5>User Defined Function Provider Classes</h5>
+ * <p>
+ * The provider class must extend Daffodil's {@code 
UserDefinedFunctionProvider}. It must implement the
+ * {@code getUserDefinedFunctionClasses()} abstract method and return every 
User Defined Function the provider supplies. The base provider offers
+ * {@code createUserDefinedFunction(namespaceURI, name)} to look up and 
instantiate UDFs that have a no‑argument
+ * constructor. If a UDF requires constructor arguments, override the lookup 
to construct it appropriately.
+ * </p>
+ * <p>
+ * Providers participate in Java’s {@link java.util.ServiceLoader} mechanism 
and therefore <strong>must</strong> include
+ * a file named {@code 
META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider} 
listing the
+ * fully qualified names of the provider class(es) contained in the JAR. 
Without this file, neither the provider nor
+ * its UDFs will be visible to Daffodil.
+ * </p>
+ *
+ * <h5>User Defined Function Classes</h5>
+ * <p>
+ * Each UDF class must extend Daffodil's {@code UserDefinedFunction}. It 
contains the functionality to be used in DFDL
+ * expressions and must be annotated with {@code 
UserDefinedFunctionIdentification}, supplying the UDF invocation
+ * {@code name} and {@code namespaceURI}. A method named {@code evaluate(...)} 
must be implemented; it is what Daffodil
+ * calls to execute the UDF. <strong>Overloaded</strong> or 
<strong>void</strong> {@code evaluate} methods are not
+ * supported.
+ * </p>
+ *
+ * <h5>User Defined Function Exceptions</h5>
+ * <ul>
+ *   <li>{@code UserDefinedFunctionProcessingError}: throw to request 
backtracking during parsing.</li>
+ *   <li>{@code UserDefinedFunctionFatalException}: throw to abort processing 
entirely.</li>
+ * </ul>
+ * <p>
+ * Any other exception type is treated as {@code 
UserDefinedFunctionFatalException}.
+ * </p>
+ *
+ * <h4>UDF Registration</h4>
+ * <p>Typical project layouts:</p>
+ *
+ * <p><strong>Scala (sbt-style):</strong></p>
+ * <pre>{@code
+ * src/
+ *   main/
+ *     scala/
+ *       org/
+ *         sgoodudfs/
+ *           example/
+ *             StringFunctions/
+ *               StringFunctionsProvider.scala  // UDF provider (may contain 
UDF classes or define them separately)
+ *     resources/
+ *       META-INF/
+ *         services/
+ *           org.apache.daffodil.api.udf.UserDefinedFunctionProvider
+ * }</pre>
+ *
+ * <p><strong>Java (generic):</strong></p>
+ * <pre>{@code
+ * src/
+ *   org/
+ *     jgoodudfs/
+ *       example/
+ *         StringFunctions/
+ *           StringFunctionsProvider.java  // UDF provider
+ *           Compare.java                  // UDF class
+ *           Replace.java                  // UDF class
+ *   META-INF/
+ *     services/
+ *       org.apache.daffodil.api.udf.UserDefinedFunctionProvider
+ * }</pre>
+ *
+ * <p>
+ * Each UDF is registered by listing the provider’s fully qualified class name 
in the text file
+ * 
<code>META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider</code>.
 The <code>META-INF</code>
+ * folder must be discoverable from the classpath root or the ServiceLoader 
will not find it.
+ * </p>
+ *
+ * <h4>UDF Usage</h4>
+ * <p>
+ * In your DFDL schema, define an xsd namespace or set the default namespace 
to match the UDF’s annotation {@code namespaceURI}, then
+ * invoke using the annotated {@code name}. For example:
+ * </p>
+ * <pre><code>
+ * // annotation on the UDF class
+ *  UserDefinedFunctionIdentification(  
+ *    name = "replace",
+ *    namespaceURI = "http://example.com/ext/stringfunctions";) 
+ * 
+ * // within the schema tag
+ * xmlns:sdf="http://example.com/ext/stringfunctions";
+ *   
+ * // within the DFDL expression
+ * ..."{ sdf:replace(., ' ', '_') }"...
+ * </code></pre>
+ *
+ *
+ * <h3>Supported Types</h3>
+ * <ul>
+ *   <li>BigDecimal (Java)</li>
+ *   <li>BigInteger (Java)</li>
+ *   <li>Boolean (boxed and primitive)</li>
+ *   <li>Byte (boxed, primitive, array of primitive)</li>
+ *   <li>Double (boxed and primitive)</li>
+ *   <li>Float (boxed and primitive)</li>
+ *   <li>Integer (boxed and primitive)</li>
+ *   <li>Long (boxed and primitive)</li>
+ *   <li>Short (boxed and primitive)</li>
+ *   <li>String</li>
+ * </ul>
+ *
+ * <h3>Restrictions</h3>
+ * <ul>
+ *   <li>Overloading unsupported</li>
+ *   <li>Void {@code evaluate} functions unsupported</li>
+ * </ul>
+ */
+package org.apache.daffodil.api.udf;
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/annotations/StringFunctions/Compare.java
 
b/daffodil-core/src/test/java/org/badudfs/annotations/StringFunctions/Compare.java
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/badudfs/annotations/StringFunctions/Compare.java
rename to 
daffodil-core/src/test/java/org/badudfs/annotations/StringFunctions/Compare.java
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/annotations/StringFunctions/FuncB.java 
b/daffodil-core/src/test/java/org/badudfs/annotations/StringFunctions/FuncB.java
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/badudfs/annotations/StringFunctions/FuncB.java
rename to 
daffodil-core/src/test/java/org/badudfs/annotations/StringFunctions/FuncB.java
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/annotations/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
 
b/daffodil-core/src/test/java/org/badudfs/annotations/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/badudfs/annotations/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
rename to 
daffodil-core/src/test/java/org/badudfs/annotations/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/annotations/StringFunctions/Replace.java
 
b/daffodil-core/src/test/java/org/badudfs/annotations/StringFunctions/Replace.java
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/badudfs/annotations/StringFunctions/Replace.java
rename to 
daffodil-core/src/test/java/org/badudfs/annotations/StringFunctions/Replace.java
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/annotations/StringFunctions/StringFunctionsProvider.java
 
b/daffodil-core/src/test/java/org/badudfs/annotations/StringFunctions/StringFunctionsProvider.java
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/badudfs/annotations/StringFunctions/StringFunctionsProvider.java
rename to 
daffodil-core/src/test/java/org/badudfs/annotations/StringFunctions/StringFunctionsProvider.java
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/evaluate/StringFunctions/FuncA.java 
b/daffodil-core/src/test/java/org/badudfs/evaluate/StringFunctions/FuncA.java
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/badudfs/evaluate/StringFunctions/FuncA.java
rename to 
daffodil-core/src/test/java/org/badudfs/evaluate/StringFunctions/FuncA.java
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/evaluate/StringFunctions/FuncB.java 
b/daffodil-core/src/test/java/org/badudfs/evaluate/StringFunctions/FuncB.java
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/badudfs/evaluate/StringFunctions/FuncB.java
rename to 
daffodil-core/src/test/java/org/badudfs/evaluate/StringFunctions/FuncB.java
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/evaluate/StringFunctions/FuncC.java 
b/daffodil-core/src/test/java/org/badudfs/evaluate/StringFunctions/FuncC.java
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/badudfs/evaluate/StringFunctions/FuncC.java
rename to 
daffodil-core/src/test/java/org/badudfs/evaluate/StringFunctions/FuncC.java
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/evaluate/StringFunctions/FuncD.java 
b/daffodil-core/src/test/java/org/badudfs/evaluate/StringFunctions/FuncD.java
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/badudfs/evaluate/StringFunctions/FuncD.java
rename to 
daffodil-core/src/test/java/org/badudfs/evaluate/StringFunctions/FuncD.java
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/evaluate/StringFunctions/FuncE.java 
b/daffodil-core/src/test/java/org/badudfs/evaluate/StringFunctions/FuncE.java
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/badudfs/evaluate/StringFunctions/FuncE.java
rename to 
daffodil-core/src/test/java/org/badudfs/evaluate/StringFunctions/FuncE.java
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/evaluate/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
 
b/daffodil-core/src/test/java/org/badudfs/evaluate/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/badudfs/evaluate/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
rename to 
daffodil-core/src/test/java/org/badudfs/evaluate/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/evaluate/StringFunctions/Replace.java 
b/daffodil-core/src/test/java/org/badudfs/evaluate/StringFunctions/Replace.java
similarity index 100%
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daffodil-udf/src/test/java/org/badudfs/evaluate/StringFunctions/Replace.java
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daffodil-core/src/test/java/org/badudfs/evaluate/StringFunctions/Replace.java
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/evaluate/StringFunctions/StringFunctionsProvider.java
 
b/daffodil-core/src/test/java/org/badudfs/evaluate/StringFunctions/StringFunctionsProvider.java
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/badudfs/evaluate/StringFunctions/StringFunctionsProvider.java
rename to 
daffodil-core/src/test/java/org/badudfs/evaluate/StringFunctions/StringFunctionsProvider.java
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/functionclasses1/StringFunctions/FuncA.java
 
b/daffodil-core/src/test/java/org/badudfs/functionclasses1/StringFunctions/FuncA.java
similarity index 100%
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daffodil-udf/src/test/java/org/badudfs/functionclasses1/StringFunctions/FuncA.java
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daffodil-core/src/test/java/org/badudfs/functionclasses1/StringFunctions/FuncA.java
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/functionclasses1/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
 
b/daffodil-core/src/test/java/org/badudfs/functionclasses1/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
similarity index 100%
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daffodil-udf/src/test/java/org/badudfs/functionclasses1/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
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daffodil-core/src/test/java/org/badudfs/functionclasses1/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/functionclasses1/StringFunctions/Replace.java
 
b/daffodil-core/src/test/java/org/badudfs/functionclasses1/StringFunctions/Replace.java
similarity index 100%
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daffodil-udf/src/test/java/org/badudfs/functionclasses1/StringFunctions/Replace.java
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daffodil-core/src/test/java/org/badudfs/functionclasses1/StringFunctions/Replace.java
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/functionclasses1/StringFunctions/StringFunctionsProvider.java
 
b/daffodil-core/src/test/java/org/badudfs/functionclasses1/StringFunctions/StringFunctionsProvider.java
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/badudfs/functionclasses1/StringFunctions/StringFunctionsProvider.java
rename to 
daffodil-core/src/test/java/org/badudfs/functionclasses1/StringFunctions/StringFunctionsProvider.java
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/functionclasses2/StringFunctions/FuncA.java
 
b/daffodil-core/src/test/java/org/badudfs/functionclasses2/StringFunctions/FuncA.java
similarity index 100%
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daffodil-udf/src/test/java/org/badudfs/functionclasses2/StringFunctions/FuncA.java
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daffodil-core/src/test/java/org/badudfs/functionclasses2/StringFunctions/FuncA.java
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/functionclasses2/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
 
b/daffodil-core/src/test/java/org/badudfs/functionclasses2/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/badudfs/functionclasses2/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
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daffodil-core/src/test/java/org/badudfs/functionclasses2/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/functionclasses2/StringFunctions/Replace.java
 
b/daffodil-core/src/test/java/org/badudfs/functionclasses2/StringFunctions/Replace.java
similarity index 100%
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daffodil-udf/src/test/java/org/badudfs/functionclasses2/StringFunctions/Replace.java
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daffodil-core/src/test/java/org/badudfs/functionclasses2/StringFunctions/Replace.java
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/functionclasses2/StringFunctions/StringFunctionsProvider.java
 
b/daffodil-core/src/test/java/org/badudfs/functionclasses2/StringFunctions/StringFunctionsProvider.java
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/badudfs/functionclasses2/StringFunctions/StringFunctionsProvider.java
rename to 
daffodil-core/src/test/java/org/badudfs/functionclasses2/StringFunctions/StringFunctionsProvider.java
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/nonUDF/StringFunctions/FuncA.java 
b/daffodil-core/src/test/java/org/badudfs/nonUDF/StringFunctions/FuncA.java
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/badudfs/nonUDF/StringFunctions/FuncA.java
rename to 
daffodil-core/src/test/java/org/badudfs/nonUDF/StringFunctions/FuncA.java
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/nonUDF/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
 
b/daffodil-core/src/test/java/org/badudfs/nonUDF/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/badudfs/nonUDF/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
rename to 
daffodil-core/src/test/java/org/badudfs/nonUDF/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/nonUDF/StringFunctions/Replace.java 
b/daffodil-core/src/test/java/org/badudfs/nonUDF/StringFunctions/Replace.java
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/badudfs/nonUDF/StringFunctions/Replace.java
rename to 
daffodil-core/src/test/java/org/badudfs/nonUDF/StringFunctions/Replace.java
diff --git 
a/daffodil-udf/src/test/java/org/badudfs/nonUDF/StringFunctions/StringFunctionsProvider.java
 
b/daffodil-core/src/test/java/org/badudfs/nonUDF/StringFunctions/StringFunctionsProvider.java
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/badudfs/nonUDF/StringFunctions/StringFunctionsProvider.java
rename to 
daffodil-core/src/test/java/org/badudfs/nonUDF/StringFunctions/StringFunctionsProvider.java
diff --git 
a/daffodil-udf/src/test/java/org/jgoodudfs/example/StringFunctions/Compare.java 
b/daffodil-core/src/test/java/org/jgoodudfs/example/StringFunctions/Compare.java
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/jgoodudfs/example/StringFunctions/Compare.java
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daffodil-core/src/test/java/org/jgoodudfs/example/StringFunctions/Compare.java
diff --git 
a/daffodil-udf/src/test/java/org/jgoodudfs/example/StringFunctions/Replace.java 
b/daffodil-core/src/test/java/org/jgoodudfs/example/StringFunctions/Replace.java
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/jgoodudfs/example/StringFunctions/Replace.java
rename to 
daffodil-core/src/test/java/org/jgoodudfs/example/StringFunctions/Replace.java
diff --git 
a/daffodil-udf/src/test/java/org/jgoodudfs/example/StringFunctions/StringFunctionsProvider.java
 
b/daffodil-core/src/test/java/org/jgoodudfs/example/StringFunctions/StringFunctionsProvider.java
similarity index 100%
rename from 
daffodil-udf/src/test/java/org/jgoodudfs/example/StringFunctions/StringFunctionsProvider.java
rename to 
daffodil-core/src/test/java/org/jgoodudfs/example/StringFunctions/StringFunctionsProvider.java
diff --git 
a/daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd 
b/daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd
similarity index 100%
rename from 
daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd
rename to 
daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd
diff --git 
a/daffodil-udf/src/test/resources/org/badmetainf/nonexistentclass/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
 
b/daffodil-core/src/test/resources/org/badmetainf/nonexistentclass/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
similarity index 100%
rename from 
daffodil-udf/src/test/resources/org/badmetainf/nonexistentclass/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
rename to 
daffodil-core/src/test/resources/org/badmetainf/nonexistentclass/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
diff --git 
a/daffodil-udf/src/test/resources/org/goodmetainf/IntegerFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
 
b/daffodil-core/src/test/resources/org/goodmetainf/IntegerFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
similarity index 100%
rename from 
daffodil-udf/src/test/resources/org/goodmetainf/IntegerFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
rename to 
daffodil-core/src/test/resources/org/goodmetainf/IntegerFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
diff --git 
a/daffodil-udf/src/test/resources/org/goodmetainf/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
 
b/daffodil-core/src/test/resources/org/goodmetainf/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
similarity index 100%
rename from 
daffodil-udf/src/test/resources/org/goodmetainf/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
rename to 
daffodil-core/src/test/resources/org/goodmetainf/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
diff --git 
a/daffodil-udf/src/test/scala/org/sbadudfs/functionclasses/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
 
b/daffodil-core/src/test/scala/org/sbadudfs/functionclasses/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
similarity index 100%
rename from 
daffodil-udf/src/test/scala/org/sbadudfs/functionclasses/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
rename to 
daffodil-core/src/test/scala/org/sbadudfs/functionclasses/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
diff --git 
a/daffodil-udf/src/test/scala/org/sbadudfs/functionclasses/StringFunctions/StringFunctionsProvider.scala
 
b/daffodil-core/src/test/scala/org/sbadudfs/functionclasses/StringFunctions/StringFunctionsProvider.scala
similarity index 100%
rename from 
daffodil-udf/src/test/scala/org/sbadudfs/functionclasses/StringFunctions/StringFunctionsProvider.scala
rename to 
daffodil-core/src/test/scala/org/sbadudfs/functionclasses/StringFunctions/StringFunctionsProvider.scala
diff --git 
a/daffodil-udf/src/test/scala/org/sbadudfs/functionclasses2/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
 
b/daffodil-core/src/test/scala/org/sbadudfs/functionclasses2/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
similarity index 100%
rename from 
daffodil-udf/src/test/scala/org/sbadudfs/functionclasses2/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
rename to 
daffodil-core/src/test/scala/org/sbadudfs/functionclasses2/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
diff --git 
a/daffodil-udf/src/test/scala/org/sbadudfs/functionclasses2/StringFunctions/StringFunctionsProvider.scala
 
b/daffodil-core/src/test/scala/org/sbadudfs/functionclasses2/StringFunctions/StringFunctionsProvider.scala
similarity index 100%
rename from 
daffodil-udf/src/test/scala/org/sbadudfs/functionclasses2/StringFunctions/StringFunctionsProvider.scala
rename to 
daffodil-core/src/test/scala/org/sbadudfs/functionclasses2/StringFunctions/StringFunctionsProvider.scala
diff --git 
a/daffodil-udf/src/test/scala/org/sbadudfs/udfexceptions/evaluating/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
 
b/daffodil-core/src/test/scala/org/sbadudfs/udfexceptions/evaluating/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
similarity index 100%
rename from 
daffodil-udf/src/test/scala/org/sbadudfs/udfexceptions/evaluating/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
rename to 
daffodil-core/src/test/scala/org/sbadudfs/udfexceptions/evaluating/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
diff --git 
a/daffodil-udf/src/test/scala/org/sbadudfs/udfexceptions/evaluating/StringFunctions/StringFunctionsProvider.scala
 
b/daffodil-core/src/test/scala/org/sbadudfs/udfexceptions/evaluating/StringFunctions/StringFunctionsProvider.scala
similarity index 100%
rename from 
daffodil-udf/src/test/scala/org/sbadudfs/udfexceptions/evaluating/StringFunctions/StringFunctionsProvider.scala
rename to 
daffodil-core/src/test/scala/org/sbadudfs/udfexceptions/evaluating/StringFunctions/StringFunctionsProvider.scala
diff --git 
a/daffodil-udf/src/test/scala/org/sbadudfs/udfexceptions2/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
 
b/daffodil-core/src/test/scala/org/sbadudfs/udfexceptions2/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
similarity index 100%
rename from 
daffodil-udf/src/test/scala/org/sbadudfs/udfexceptions2/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
rename to 
daffodil-core/src/test/scala/org/sbadudfs/udfexceptions2/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
diff --git 
a/daffodil-udf/src/test/scala/org/sbadudfs/udfexceptions2/StringFunctions/StringFunctionsProvider.scala
 
b/daffodil-core/src/test/scala/org/sbadudfs/udfexceptions2/StringFunctions/StringFunctionsProvider.scala
similarity index 100%
rename from 
daffodil-udf/src/test/scala/org/sbadudfs/udfexceptions2/StringFunctions/StringFunctionsProvider.scala
rename to 
daffodil-core/src/test/scala/org/sbadudfs/udfexceptions2/StringFunctions/StringFunctionsProvider.scala
diff --git 
a/daffodil-udf/src/test/scala/org/sbadudfs/udfpexceptions/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
 
b/daffodil-core/src/test/scala/org/sbadudfs/udfpexceptions/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
similarity index 100%
rename from 
daffodil-udf/src/test/scala/org/sbadudfs/udfpexceptions/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
rename to 
daffodil-core/src/test/scala/org/sbadudfs/udfpexceptions/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
diff --git 
a/daffodil-udf/src/test/scala/org/sbadudfs/udfpexceptions/StringFunctions/StringFunctionsProvider.scala
 
b/daffodil-core/src/test/scala/org/sbadudfs/udfpexceptions/StringFunctions/StringFunctionsProvider.scala
similarity index 100%
rename from 
daffodil-udf/src/test/scala/org/sbadudfs/udfpexceptions/StringFunctions/StringFunctionsProvider.scala
rename to 
daffodil-core/src/test/scala/org/sbadudfs/udfpexceptions/StringFunctions/StringFunctionsProvider.scala
diff --git 
a/daffodil-udf/src/test/scala/org/sbadudfs/udfpexceptions2/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
 
b/daffodil-core/src/test/scala/org/sbadudfs/udfpexceptions2/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
similarity index 100%
rename from 
daffodil-udf/src/test/scala/org/sbadudfs/udfpexceptions2/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
rename to 
daffodil-core/src/test/scala/org/sbadudfs/udfpexceptions2/StringFunctions/META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider
diff --git 
a/daffodil-udf/src/test/scala/org/sbadudfs/udfpexceptions2/StringFunctions/StringFunctionsProvider.scala
 
b/daffodil-core/src/test/scala/org/sbadudfs/udfpexceptions2/StringFunctions/StringFunctionsProvider.scala
similarity index 100%
rename from 
daffodil-udf/src/test/scala/org/sbadudfs/udfpexceptions2/StringFunctions/StringFunctionsProvider.scala
rename to 
daffodil-core/src/test/scala/org/sbadudfs/udfpexceptions2/StringFunctions/StringFunctionsProvider.scala
diff --git 
a/daffodil-udf/src/test/scala/org/sgoodudfs/example/IntegerFunctions/IntegerFunctionsProvider.scala
 
b/daffodil-core/src/test/scala/org/sgoodudfs/example/IntegerFunctions/IntegerFunctionsProvider.scala
similarity index 100%
rename from 
daffodil-udf/src/test/scala/org/sgoodudfs/example/IntegerFunctions/IntegerFunctionsProvider.scala
rename to 
daffodil-core/src/test/scala/org/sgoodudfs/example/IntegerFunctions/IntegerFunctionsProvider.scala
diff --git 
a/daffodil-udf/src/test/scala/org/sgoodudfs/example/StringFunctions/StringFunctionsProvider.scala
 
b/daffodil-core/src/test/scala/org/sgoodudfs/example/StringFunctions/StringFunctionsProvider.scala
similarity index 100%
rename from 
daffodil-udf/src/test/scala/org/sgoodudfs/example/StringFunctions/StringFunctionsProvider.scala
rename to 
daffodil-core/src/test/scala/org/sgoodudfs/example/StringFunctions/StringFunctionsProvider.scala
diff --git 
a/daffodil-udf/src/test/scala/org/sgoodudfs/example/SupportedTypesFunctions/SupportedTypesFunctionsProvider.scala
 
b/daffodil-core/src/test/scala/org/sgoodudfs/example/SupportedTypesFunctions/SupportedTypesFunctionsProvider.scala
similarity index 100%
rename from 
daffodil-udf/src/test/scala/org/sgoodudfs/example/SupportedTypesFunctions/SupportedTypesFunctionsProvider.scala
rename to 
daffodil-core/src/test/scala/org/sgoodudfs/example/SupportedTypesFunctions/SupportedTypesFunctionsProvider.scala
diff --git a/daffodil-layers/README.md b/daffodil-layers/README.md
deleted file mode 100644
index a6679f41e..000000000
--- a/daffodil-layers/README.md
+++ /dev/null
@@ -1,21 +0,0 @@
-<!--
-  Licensed to the Apache Software Foundation (ASF) under one or more
-  contributor license agreements.  See the NOTICE file distributed with
-  this work for additional information regarding copyright ownership.
-  The ASF licenses this file to You under the Apache License, Version 2.0
-  (the "License"); you may not use this file except in compliance with
-  the License.  You may obtain a copy of the License at
-
-      http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
--->
-
-# Daffodil Layers
-
-See the <a href="http://daffodil.apache.org/layers";>Layer Usage 
Documentation</a> for how a layer is
-used from a Daffodil DFDL schema.
\ No newline at end of file
diff --git 
a/daffodil-test-integration/src/test/scala/org/apache/daffodil/cliTest/TestCLIPlugins.scala
 
b/daffodil-test-integration/src/test/scala/org/apache/daffodil/cliTest/TestCLIPlugins.scala
index 4c66df356..976a469ce 100644
--- 
a/daffodil-test-integration/src/test/scala/org/apache/daffodil/cliTest/TestCLIPlugins.scala
+++ 
b/daffodil-test-integration/src/test/scala/org/apache/daffodil/cliTest/TestCLIPlugins.scala
@@ -105,10 +105,10 @@ class TestCLIPlugins {
    */
   @Test def test_reload_missing_udf(): Unit = {
     val schema = path(
-      
"daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
+      
"daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
     )
     val classpath = testClasspath(
-      s"daffodil-udf/target/$scalaVersionForTargetPath/test-classes/"
+      s"daffodil-core/target/$scalaVersionForTargetPath/test-classes/"
     )
 
     withTempFile { parser =>
diff --git 
a/daffodil-test-integration/src/test/scala/org/apache/daffodil/cliTest/TestCLIUdfs.scala
 
b/daffodil-test-integration/src/test/scala/org/apache/daffodil/cliTest/TestCLIUdfs.scala
index b5d31a901..87a72a304 100644
--- 
a/daffodil-test-integration/src/test/scala/org/apache/daffodil/cliTest/TestCLIUdfs.scala
+++ 
b/daffodil-test-integration/src/test/scala/org/apache/daffodil/cliTest/TestCLIUdfs.scala
@@ -33,7 +33,7 @@ class TestCLIUdfs {
    * the directory containing the META-INF dir needed for the test.
    */
   private def udfClasspath(extra: String*): Seq[Path] = {
-    val classes = 
path(s"daffodil-udf/target/$scalaVersionForTargetPath/test-classes/")
+    val classes = 
path(s"daffodil-core/target/$scalaVersionForTargetPath/test-classes/")
     val paths = extra.map(path(_))
     classes +: paths
   }
@@ -44,7 +44,7 @@ class TestCLIUdfs {
    */
   @Test def test_noUdfsLoaded_regular_schema(): Unit = {
     val schema = path(
-      
"daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
+      
"daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
     )
 
     runCLI(args"-v parse -s $schema -r fn_func", fork = true) { cli =>
@@ -62,7 +62,7 @@ class TestCLIUdfs {
    */
   @Test def test_noUdfsLoaded_udf_schema(): Unit = {
     val schema = path(
-      
"daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
+      
"daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
     )
 
     runCLI(args"-v parse -s $schema -r user_func1", fork = true) { cli =>
@@ -80,10 +80,10 @@ class TestCLIUdfs {
    */
   @Test def test_noUdfsLoaded_MissingClassInMetaInfFile(): Unit = {
     val schema = path(
-      
"daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
+      
"daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
     )
     val classpath = udfClasspath(
-      "daffodil-udf/src/test/resources/org/badmetainf/nonexistentclass/"
+      "daffodil-core/src/test/resources/org/badmetainf/nonexistentclass/"
     )
 
     runCLI(args"-v parse -s $schema -r user_func1", classpath) { cli =>
@@ -104,7 +104,7 @@ class TestCLIUdfs {
    */
   @Test def test_noUdfsLoaded_MissingMetaInfFile(): Unit = {
     val schema = path(
-      
"daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
+      
"daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
     )
     val classpath = udfClasspath()
 
@@ -119,10 +119,10 @@ class TestCLIUdfs {
    */
   @Test def test_UDFPClass_NoUdfClasses(): Unit = {
     val schema = path(
-      
"daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
+      
"daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
     )
     val classpath = udfClasspath(
-      
"daffodil-udf/src/test/java/org/badudfs/functionclasses1/StringFunctions/"
+      
"daffodil-core/src/test/java/org/badudfs/functionclasses1/StringFunctions/"
     )
 
     runCLI(args"-v parse -s $schema -r user_func1", classpath) { cli =>
@@ -141,10 +141,10 @@ class TestCLIUdfs {
    */
   @Test def test_UDFPClass_emptyUdfClasses(): Unit = {
     val schema = path(
-      
"daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
+      
"daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
     )
     val classpath = udfClasspath(
-      
"daffodil-udf/src/test/java/org/badudfs/functionclasses2/StringFunctions/"
+      
"daffodil-core/src/test/java/org/badudfs/functionclasses2/StringFunctions/"
     )
 
     runCLI(args"-v parse -s $schema -r user_func1", classpath) { cli =>
@@ -164,10 +164,10 @@ class TestCLIUdfs {
    */
   @Test def test_UDFClass_nonUDF(): Unit = {
     val schema = path(
-      
"daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
+      
"daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
     )
     val classpath = udfClasspath(
-      "daffodil-udf/src/test/java/org/badudfs/nonUDF/StringFunctions/"
+      "daffodil-core/src/test/java/org/badudfs/nonUDF/StringFunctions/"
     )
 
     runCLI(args"-v parse -s $schema -r user_func1", classpath) { cli =>
@@ -191,10 +191,10 @@ class TestCLIUdfs {
    */
   @Test def test_UDFClass_nonAnn(): Unit = {
     val schema = path(
-      
"daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
+      
"daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
     )
     val classpath = udfClasspath(
-      "daffodil-udf/src/test/java/org/badudfs/annotations/StringFunctions/"
+      "daffodil-core/src/test/java/org/badudfs/annotations/StringFunctions/"
     )
 
     runCLI(args"-v parse -s $schema -r user_func1", classpath) { cli =>
@@ -226,10 +226,10 @@ class TestCLIUdfs {
    */
   @Test def test_UDFClass_noEvaluate(): Unit = {
     val schema = path(
-      
"daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
+      
"daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
     )
     val classpath = udfClasspath(
-      "daffodil-udf/src/test/java/org/badudfs/evaluate/StringFunctions/"
+      "daffodil-core/src/test/java/org/badudfs/evaluate/StringFunctions/"
     )
 
     runCLI(args"-v parse -s $schema -r user_func1", classpath) { cli =>
@@ -273,10 +273,10 @@ class TestCLIUdfs {
    */
   @Test def test_UDFClass_CustomExceptionOnEvaluate(): Unit = {
     val schema = path(
-      
"daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
+      
"daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
     )
     val classpath = udfClasspath(
-      
"daffodil-udf/src/test/scala/org/sbadudfs/udfexceptions/evaluating/StringFunctions/"
+      
"daffodil-core/src/test/scala/org/sbadudfs/udfexceptions/evaluating/StringFunctions/"
     )
 
     runCLI(args"parse -s $schema -r user_func2", classpath) { cli =>
@@ -296,10 +296,10 @@ class TestCLIUdfs {
    */
   @Test def test_UDFClass_ProcessingErrorOnEvaluate(): Unit = {
     val schema = path(
-      
"daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
+      
"daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
     )
     val classpath = udfClasspath(
-      
"daffodil-udf/src/test/scala/org/sbadudfs/udfexceptions/evaluating/StringFunctions/"
+      
"daffodil-core/src/test/scala/org/sbadudfs/udfexceptions/evaluating/StringFunctions/"
     )
 
     runCLI(args"parse -s $schema -r user_func3", classpath) { cli =>
@@ -315,10 +315,10 @@ class TestCLIUdfs {
    */
   @Test def test_UDFClass_exceptionOnLoad(): Unit = {
     val schema = path(
-      
"daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
+      
"daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
     )
     val classpath = udfClasspath(
-      
"daffodil-udf/src/test/scala/org/sbadudfs/udfexceptions2/StringFunctions/"
+      
"daffodil-core/src/test/scala/org/sbadudfs/udfexceptions2/StringFunctions/"
     )
 
     runCLI(args"-v parse -s $schema -r user_func3", classpath) { cli =>
@@ -340,10 +340,10 @@ class TestCLIUdfs {
    */
   @Test def test_UDFPClass_exceptionOnLoadingUDFs(): Unit = {
     val schema = path(
-      
"daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
+      
"daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
     )
     val classpath = udfClasspath(
-      
"daffodil-udf/src/test/scala/org/sbadudfs/udfpexceptions/StringFunctions/"
+      
"daffodil-core/src/test/scala/org/sbadudfs/udfpexceptions/StringFunctions/"
     )
 
     runCLI(args"-v parse -s $schema -r user_func3", classpath) { cli =>
@@ -363,10 +363,10 @@ class TestCLIUdfs {
    */
   @Test def test_UDFPClass_exceptionOnLoad(): Unit = {
     val schema = path(
-      
"daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
+      
"daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
     )
     val classpath = udfClasspath(
-      
"daffodil-udf/src/test/scala/org/sbadudfs/udfpexceptions2/StringFunctions/"
+      
"daffodil-core/src/test/scala/org/sbadudfs/udfpexceptions2/StringFunctions/"
     )
 
     runCLI(args"-vv parse -s $schema -r user_func3", classpath) { cli =>
@@ -390,10 +390,10 @@ class TestCLIUdfs {
    */
   @Test def test_UDFPClass_incorrectUDFObject(): Unit = {
     val schema = path(
-      
"daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
+      
"daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
     )
     val classpath = udfClasspath(
-      
"daffodil-udf/src/test/scala/org/sbadudfs/functionclasses/StringFunctions/"
+      
"daffodil-core/src/test/scala/org/sbadudfs/functionclasses/StringFunctions/"
     )
 
     runCLI(args"-v parse -s $schema -r user_func3", classpath) { cli =>
@@ -412,10 +412,10 @@ class TestCLIUdfs {
    */
   @Test def test_UDFPClass_incorrectUDFCreateImplementation(): Unit = {
     val schema = path(
-      
"daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
+      
"daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
     )
     val classpath = udfClasspath(
-      
"daffodil-udf/src/test/scala/org/sbadudfs/functionclasses/StringFunctions/"
+      
"daffodil-core/src/test/scala/org/sbadudfs/functionclasses/StringFunctions/"
     )
 
     runCLI(args"-v parse -s $schema -r user_func2", classpath) { cli =>
@@ -437,10 +437,10 @@ class TestCLIUdfs {
    */
   @Test def test_UDFClass_serializability(): Unit = {
     val schema = path(
-      
"daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
+      
"daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
     )
     val classpath = udfClasspath(
-      
"daffodil-udf/src/test/scala/org/sbadudfs/functionclasses2/StringFunctions/"
+      
"daffodil-core/src/test/scala/org/sbadudfs/functionclasses2/StringFunctions/"
     )
 
     runCLI(args"-vv save-parser -s $schema -r user_func4", classpath) { cli =>
@@ -468,10 +468,10 @@ class TestCLIUdfs {
    */
   @Test def test_UDFClass_serializability2(): Unit = {
     val schema = path(
-      
"daffodil-udf/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
+      
"daffodil-core/src/test/resources/org/apache/daffodil/udf/genericUdfSchema.xsd"
     )
     val classpath = udfClasspath(
-      
"daffodil-udf/src/test/scala/org/sbadudfs/functionclasses2/StringFunctions/"
+      
"daffodil-core/src/test/scala/org/sbadudfs/functionclasses2/StringFunctions/"
     )
 
     withTempFile { parser =>
diff --git a/daffodil-udf/README.md b/daffodil-udf/README.md
deleted file mode 100644
index f4dad15c4..000000000
--- a/daffodil-udf/README.md
+++ /dev/null
@@ -1,149 +0,0 @@
-<!--
-  Licensed to the Apache Software Foundation (ASF) under one or more
-  contributor license agreements.  See the NOTICE file distributed with
-  this work for additional information regarding copyright ownership.
-  The ASF licenses this file to You under the Apache License, Version 2.0
-  (the "License"); you may not use this file except in compliance with
-  the License.  You may obtain a copy of the License at
-
-      http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
--->
-
-# User Defined Functions
-
-## Introduction
-
-Apache Daffodil allows execution of Java/Scala external/user defined functions 
in DFDL Expressions.
-
-## Getting Started
-
-The implementer will be expected to provide a JAR via the classpath or 
Daffodil classpath containing at least two
-classes:
-a provider class and its associated function class(es).
-
-All providers must be registered in the 
*META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider*
-file, regardless of how many are provided.
-
-### UDF Implementation
-
-#### User Defined Function Provider Classes
-
-The provider class must extend Daffodil's `UserDefinedFuntionProvider` class. 
This class must implement the
-`getUserDefinedFunctionClasses` abstract method, and ensure it returns all the 
User Defined Functions this class is
-providing. The `UserDefinedFunctionProvider` class provides a 
`createUserDefinedFunction` to lookup and initialize User
-Defined Functions that have no-argument constructors, based on a supplied name 
and namespaceURI. If the User Defined
-Function has a constructor that takes arguments, then the default lookup 
function cannot be used, and the class must
-override the look up function with its own implementation for such UDFs.
-
-This class will act as a traditional service provider as explained in the 
ServiceLoader API, and must have a
-*META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider* 
file in its project. This file must contain
-the fully qualified name(s) of the **provider class(es)** in the JAR. Without 
that file, neither this class nor any of
-the User Defined Function classes it provides will be visible to Daffodil.
-
-The class can provide as many User Defined Function classes as it wishes, as 
long as they are made available by the
-`getUserDefinedFunctionClasses` function.
-
-#### User Defined Function Classes
-
-The User Defined Function class must extend Daffodil's `UserDefinedFunction` 
class. This class will contain the actual
-functionality implementers wish to add to DFDL Expressions. It must be 
annotated with the
-`UserDefinedFunctionIdentification` annotation class, with the name and 
namespaceURI fields filled in with how the UDF
-will be called from the schema. It must also implement a function named 
*evaluate* that Daffodil will call to execute
-the desired UDF functionality. *There is no support for overloaded or void 
evaluate functions*.
-
-#### User Defined Function Exceptions
-
-Daffodil proves two exception classes for users that wish to throw an error 
from within their UDFs.
-
-* `UserDefinedFunctionProcessingError` can be thrown when the implementer 
wishes to cause backtracking during parsing
-* `UserDefinedFunctionFatalException` can be thrown when the implementer 
wishes processing to be aborted all together
-
-All other exceptions are treated as `UserDefinedFunctionFatalException`.
-
-### UDF Registration
-
-Once implemented, a UDF can be expected to have one of the following structures
-
-```
-// sample scala UDF with sbt structure
-// based on sample UDF in daffodil-udf/src/test/scala
-src/
-  main/
-    scala/
-      org/
-        sgoodudfs/
-          example/
-              StringFunctions/
-                StringFunctionsProvider.scala //UDF Provider with UDF classes 
declared within
-    resources/
-      META-INF/
-        services/
-          org.apache.daffodil.api.udf.UserDefinedFunctionProvider
-```
-
-or
-
-```
-// sample java UDF with generic structure
-// based on sample UDF in daffodil-udf/src/test/java
-src/
-  org/
-    jgoodudfs/
-      example/
-          StringFunctions/
-            StringFunctionsProvider.java //UDF Provider
-            Compare.java //UDF class
-            Replace.java //UDF class
-  META-INF/
-    services/
-      org.apache.daffodil.api.udf.UserDefinedFunctionProvider
-```
-
-Each UDF is registered by including the fully qualified name of its provider 
in a text file named
-`META-INF/services/org.apache.daffodil.api.udf.UserDefinedFunctionProvider`. 
The META-INF folder must be accessible from
-the root of whatever paths are on the classpath, otherwise it won't be picked 
up by ServiceLoader.
-
-### UDF Usage
-
-To use within a DFDL expression, you will need to either define an xsd 
namespace or set as your default namespace a
-value that matches the namespaceURI of the UDF's annotation. Then you can call 
the function with the name field of the
-function class's annotation. For example:
-
-```xml
-<!--
-For a UDF with the following annotation
-@UserDefinedFunctionIdentification(
-    name = "replace",
-    namespaceURI = "http://example.com/ext/stringfunctions";)
--->
-
-<!-- within the schema tag -->
-  xmlns:sdf="http://example.com/ext/stringfunctions";
-
-  <!-- within the DFDL expression -->
-  ..."{ sdf:replace(., ' ', '_') }"...
-```
-
-## Supported Types
-
-* BigDecimal: Java
-* BigInteger: Java
-* Boolean: Boxed and Primitive
-* Byte: Boxed, Primitive, Array of Primitive
-* Double: Boxed and Primitive
-* Float: Boxed and Primitive
-* Integer: Boxed and Primitive
-* Long: Boxed and Primitive
-* Short: Boxed and Primitive
-* String
-
-## Restrictions
-
-- Overloading unsupported
-- Void functions unsupported
diff --git a/daffodil-udf/src/main/resources/META-INF/LICENSE 
b/daffodil-udf/src/main/resources/META-INF/LICENSE
deleted file mode 100644
index d64569567..000000000
--- a/daffodil-udf/src/main/resources/META-INF/LICENSE
+++ /dev/null
@@ -1,202 +0,0 @@
-
-                                 Apache License
-                           Version 2.0, January 2004
-                        http://www.apache.org/licenses/
-
-   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
-
-   1. Definitions.
-
-      "License" shall mean the terms and conditions for use, reproduction,
-      and distribution as defined by Sections 1 through 9 of this document.
-
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-   END OF TERMS AND CONDITIONS
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-   APPENDIX: How to apply the Apache License to your work.
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-      To apply the Apache License to your work, attach the following
-      boilerplate notice, with the fields enclosed by brackets "[]"
-      replaced with your own identifying information. (Don't include
-      the brackets!)  The text should be enclosed in the appropriate
-      comment syntax for the file format. We also recommend that a
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-      same "printed page" as the copyright notice for easier
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-   Copyright [yyyy] [name of copyright owner]
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-   Licensed under the Apache License, Version 2.0 (the "License");
-   you may not use this file except in compliance with the License.
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diff --git a/daffodil-udf/src/main/resources/META-INF/NOTICE 
b/daffodil-udf/src/main/resources/META-INF/NOTICE
deleted file mode 100644
index e1332c0ac..000000000
--- a/daffodil-udf/src/main/resources/META-INF/NOTICE
+++ /dev/null
@@ -1,10 +0,0 @@
-Apache Daffodil
-Copyright 2025 The Apache Software Foundation
-
-This product includes software developed at
-The Apache Software Foundation (http://www.apache.org/).
-
-Based on source code originally developed by
-- The Univerisity of Illinois National Center for Supercomputing Applications 
(http://www.ncsa.illinois.edu/)
-- Tresys Technology (http://www.tresys.com/)
-- International Business Machines Corporation (http://www.ibm.com)

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