[rules-users] Failed to read schema document when trying to transform from XML to DRL

[Chang Liu]

Hi there,

Error message:
(null: 5, 77): schema_reference.4: Failed to read schema document 
'drools.org/drools-5.0.xsd', because 1) could not find the document; 2) the 
document could not be read; 3) the root element of the document is not 
<xsd:schema>.

I ran into this issue when experimenting a project that transforming the rules 
back and forth from DRL to XML with utility classes as documented in following 
link:

http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/drools-expert/html/ch04.html#d0e5750

My code:
...
XmlPackageReader xmlReader = new XmlPackageReader(null);
StringReader sr = new StringReader(rulesInXml);
try {
                PackageDescr  packageDescr = xmlReader.read(sr);
DrlDumper drlDumper = new DrlDumper();
String drlString = drlDumper.dump(packageDescr);
}
catch (Exception ex) {
                System.out.println(ex);
}
...

where string "rulesInXml" is the result xml string transformed from a valid 
.drl file. It looks like:
<?xml version="1.0" encoding="UTF-8"?>
<package name="com.sample"
      xmlns="http://drools.org/drools-5.0";
      xmlns:xs="http://www.w3.org/2001/XMLSchema-instance";
      xs:schemaLocation="http://drools.org/drools-5.0 
drools.org/drools-5.0.xsd">
<import name="com.sample.DroolsTest.Message" />

<rule name="Hello World">
<lhs><pattern identifier="m" object-type="Message" >
<field-constraint field-name="status">
<qualified-identifier-restriction evaluator="==">Message.HELLO 
</qualified-identifier-restriction>
</field-constraint>
<field-binding field-name="message" identifier="myMessage" />
</pattern>
</lhs>

<rhs>       System.out.println( myMessage );
            m.setMessage( "Goodbye cruel world" );
            m.setStatus( Message.GOODBYE );
            update( m );
</rhs>
</rule>

<rule name="GoodBye">
<lhs><pattern object-type="Message" >
<field-constraint field-name="status">
<qualified-identifier-restriction evaluator="==">Message.GOODBYE 
</qualified-identifier-restriction>

</field-constraint>
<field-binding field-name="message" identifier="myMessage" />
</pattern>
</lhs>

<rhs>       System.out.println( myMessage );
</rhs>
</rule>
</package>

What did I miss here?

Moreover, the Drools 5.0 API's for XML support are poorly-documented. For 
example, the constructors of class "XmlPackageReader" has an arg of 
"SemanticModules" type which is not documented. :(

Any help would be highly appreciated!

Thanks,
Chang

**********************************************************************
CONFIDENTIALITY NOTICE: The information contained in this email is intended 
only for the person or entity to which it is addressed and may contain 
confidential and/or privileged material. If you are not the intended recipient, 
you are hereby notified that any unauthorized review, use, dissemination, 
distribution or copying of this communication is prohibited and may be subject 
to legal restriction or sanction. If you have received this email in error, 
please notify the sender immediately to arrange for return or destruction of 
the information and all copies. If you are the intended recipient but do not 
wish to receive communications through this medium, please advise the sender 
immediately. Thank you

_______________________________________________
rules-users mailing list
rules-users@lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users