olabusayoT commented on code in PR #180:
URL: https://github.com/apache/daffodil-site/pull/180#discussion_r2289061975
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site/mg_4.0.0.md:
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+---
+layout: page
+title: Migration Guide
+group: nav-right
+---
+
+<!--
+{% comment %}
+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.
+{% endcomment %}
+-->
+
+# 3.11.0 to 4.0.0
+
+The most important changes to be aware of in this release are:
+
+- Daffodil has merged daffodil-udf, daffodil-runtime1,
daffodil-runtime1-unparser, daffodil-lib,
+ daffodil-sapi, daffodil-japi and daffodil-io into daffodil-core.
+- Daffodil has replaced the Validation
Modes(`withValidationMode`)/`withValidator` with the
`withValidation(validatorName[, validationConfigurationURI])` method. Built-in
validator names are xerces, daffodil, schematron and off.
+- com.typesafe.config class has been replaced with java.util.Properties class
for Validators configuration
+
+## Dependencies
+
+Since daffodil-udf and daffodil-sapi/japi have been merged into daffodil-core,
the dependencies when
+ using scala/java or udfs have changed to daffodil-core.
+
+<div>
+<ul class="nav nav-tabs">
+<li class="active"><a data-toggle="tab" href="#java_dep">Java</a></li>
+<li><a data-toggle="tab" href="#scala_dep">Scala</a></li>
+</ul>
+<div class="tab-content">
+<div id="java_dep" class="tab-pane active" markdown="1">
+
+```xml
+<dependency>
+ <groupId>org.apache.daffodil</groupId>
+ <artifactId>daffodil-core_3</artifactId>
+ <version>4.0.0</version>
+</dependency>
+```
+</div>
+<div id="scala_dep" class="tab-pane" markdown="1">
+
+```scala
+libraryDependencies += "org.apache.daffodil" %% "daffodil-core" % "4.0.0"
+```
+</div>
+</div>
+</div>
+
+## Compiling Schemas
+This remains generally unchanged for Java users as passing in strings (or
nulls) is still supported. For Scala users, Options are no longer supported in
the api and strings (or nulls) must be passed in instead.
+
+<div>
+<ul class="nav nav-tabs">
+<li class="active"><a data-toggle="tab" href="#java_compile">Java</a></li>
+<li><a data-toggle="tab" href="#scala_compile">Scala</a></li>
+</ul>
+<div class="tab-content">
+<div id="java_compile" class="tab-pane active" markdown="1">
+
+```java
+File schemaFile = new File("/some/schema/file.xsd");
+String rootName = "e1"; // can also be null to default to root element
+String rootNamespace = "http://example.com";; // can also be null to default to
root element namespace
+org.apache.daffodil.api.ProcessorFactory pf = c.compileFile(schemaFile,
rootName, rootNamespace);
+```
+</div>
+<div id="scala_compile" class="tab-pane" markdown="1">
+
+```scala
+val schemaFile: File = new File("/some/schema/file.xsd")
+val rootName: String = "e1" // can also be null to default to root element
+val rootNamespace: String = "http://example.com"; // can also be null to
default to root element namespace
+val pf: org.apache.daffodil.api.ProcessorFactory = c.compileFile(schemaFile,
rootName, rootNamespace)
+```
+</div>
+</div>
+</div>
+
+## Adding Validation to Compiler
+Validation Modes (i.e `withValidationMode(ValidationMode.*)`) and the
`withValidator(validatorObj)` were removed in place of
`withValidation(validator.name[, validationConfigurationURI])`.
+
+<div>
+<ul class="nav nav-tabs">
+<li class="active"><a data-toggle="tab" href="#java_validate">Java</a></li>
+<li><a data-toggle="tab" href="#scala_validate">Scala</a></li>
+</ul>
+<div class="tab-content">
+<div id="java_validate" class="tab-pane active" markdown="1">
+
+```java
+org.apache.daffodil.api.ProcessorFactory pf = c.compileFile(schemaFile,
rootName, rootNamespace);
+URI mainValidationSchemaUri = URI.create("file:///path/to/other/schema.xsd");
+org.apache.daffodil.api.DataProcessor dp =
pf.onPath("/").withValidation("xerces", mainValidationSchemaUri);
+```
+</div>
+<div id="scala_validate" class="tab-pane" markdown="1">
+
+```scala
+val pf: org.apache.daffodil.api.ProcessorFactory = c.compileFile(schemaFile,
rootName, rootNamespace)
+val mainValidationSchemaUri = URI.create("file:///path/to/other/schema.xsd";
+val dp: org.apache.daffodil.api.DataProcessor =
pf.onPath("/").withValidation("xerces", mainValidationSchemaUri)
+```
+</div>
+</div>
+</div>
+
+## Parsing Data
+Factory methods to get `InputSourceDataInputStream` and `InfosetOutputter`
objects have been added via
+`Daffodil.newInputSourceDataInputStream` and `Infoset.new*InfosetOutputter`
+
+<div>
+<ul class="nav nav-tabs">
+<li class="active"><a data-toggle="tab" href="#java_parse">Java</a></li>
+<li><a data-toggle="tab" href="#scala_parse">Scala</a></li>
+</ul>
+<div class="tab-content">
+<div id="java_parse" class="tab-pane active" markdown="1">
+
+```java
+java.io.File file = getResource("/test/api/myData.dat");
+java.io.FileInputStream fis = new java.io.FileInputStream(file);
+try (InputSourceDataInputStream dis =
Daffodil.newInputSourceDataInputStream(fis)) {
+ org.apache.daffodil.api.infoset.JDOMInfosetOutputter outputter =
Daffodil.newJDOMInfosetOutputter();
+ org.apache.daffodil.api.ParseResult res = dp.parse(dis, outputter);
+}
+```
+</div>
+<div id="scala_parse" class="tab-pane" markdown="1">
+
+```scala
+val file = getResource("/test/api/myData.dat")
+val fis = new java.io.FileInputStream(file)
+Using.resource(Daffodil.newInputSourceDataInputStream(fis)) { input =>
+ val outputter = Daffodil.newScalaXMLInfosetOutputter()
+ val res = dp.parse(input, outputter)
+}
+```
+</div>
+</div>
+</div>
+
+## Unparsing Infoset
+Factory methods to get an `InfosetInputter` object has been added via
`Daffodil.new*InfosetInputter`
+
+<div>
+<ul class="nav nav-tabs">
+<li class="active"><a data-toggle="tab" href="#java_unparse">Java</a></li>
+<li><a data-toggle="tab" href="#scala_unparse">Scala</a></li>
+</ul>
+<div class="tab-content">
+<div id="java_unparse" class="tab-pane active" markdown="1">
+
+```java
+java.io.ByteArrayOutputStream bos = new java.io.ByteArrayOutputStream();
+java.nio.channels.WritableByteChannel wbc =
java.nio.channels.Channels.newChannel(bos);
+org.apache.daffodil.api.infoset.InfosetInputter inputter =
Daffodil.newJDOMInfosetInputter(outputter.getResult());
+org.apache.daffodil.api.UnparseResult res2 = dp.unparse(inputter, wbc);
+```
+</div>
+<div id="scala_unparse" class="tab-pane" markdown="1">
+
+```scala
+val bos = new java.io.ByteArrayOutputStream()
+val wbc = java.nio.channels.Channels.newChannel(bos)
+val inputter = Daffodil.newScalaXMLInfosetInputter(outputter.getResult())
+val res2 = dp.unparse(inputter, wbc)
+```
+</div>
+</div>
+</div>
+
+## Using Custom Plugin Layers
+Custom Plug-in layers must extend the `org.apache.daffodil.api.layers.Layer`
class, and be
+referenced in a `META-INF/services` file with the same class reference as the
name. This
+path has changed in Daffodil 4.0.0.
+
+<div>
+<ul class="nav nav-tabs">
+<li class="active"><a data-toggle="tab" href="#java_layers">Java</a></li>
+<li><a data-toggle="tab" href="#scala_layers">Scala</a></li>
+</ul>
+<div class="tab-content">
+<div id="java_layers" class="tab-pane active" markdown="1">
+
+```java
+// example layer class
+import org.apache.daffodil.api.layers.Layer;
+
+public final class GZipLayer extends Layer {
+ // implementation details
+}
+
+// in META-INF/services/org.apache.daffodil.api.layers.Layer
+org.apache.daffodil.layers.runtime1.GZipLayer
Review Comment:
I think @stevedlawrence had mentioned in a PR that these were not to be part
of the api, which is why they are still in layers.runtime1 package.
https://github.com/apache/daffodil/pull/1525#discussion_r2258002733
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