W3C home > Mailing lists > Public > xmlschema-dev@w3.org > October 2004

Re: substitutionGroup across namespaces

From: Mark Proctor <mproctor@codehaus.org>
Date: Mon, 25 Oct 2004 14:35:01 +0200
Message-ID: <417CF2F5.1010607@codehaus.org>
To: George Cristian Bina <george@sync.ro>
CC: xmlschema-dev@w3.org

I just tried it doing getResource and toExternalForm which produces the 
following string:
jar:file:/D:/java/workspaces/drools/target/drools-java-2.0-beta-18.jar!/META-INF/java.xsd 
jar:file:/D:/java/workspaces/drools/target/drools-python-2.0-beta-18.jar!/META-INF/python.xsd 
jar:file:/D:/java/workspaces/drools/target/drools-groovy-2.0-beta-18.jar!/META-INF/groovy.xsd 
jar:file:/D:/java/workspaces/drools/target/drools-base-2.0-beta-18.jar!/META-INF/rules.xsd

I do this using the following code:
URL java = cl.getResource( "META-INF/java.xsd" );
URL python = cl.getResource( "META-INF/python.xsd" );
URL groovy = cl.getResource( "META-INF/groovy.xsd" );
URL rules = cl.getResource( "META-INF/rules.xsd" );
String url = "";

if ( java != null ) url = url + java.toExternalForm() + " ";
if ( python != null ) url = url + python.toExternalForm() + " ";
if ( groovy != null ) url = url + groovy.toExternalForm() + " ";
if ( rules != null ) url = url + rules.toExternalForm();

parser.setProperty( JAXP_SCHEMA_LANGUAGE, W3C_XML_SCHEMA );
parser.setProperty("http://apache.org/xml/properties/schema/external-schemaLocation", 
url);

But now I get the following error, like its not finding the xsds at all:
 (jar:file:/D:/java/workspaces/drools/drools-examples/target/drools-examples-2.0-beta-18.jar!/org/drools/examples/fibonacci/fibonacci.java.drl:5,57) 
: cvc-elt.1: Cannot find the declaration of element 'rule-set'.

Mark
Mark Proctor wrote:

> I currently use:
>    private static final String JAXP_SCHEMA_LANGUAGE = 
> "http://java.sun.com/xml/jaxp/properties/schemaLanguage";
>    private static final String W3C_XML_SCHEMA       = 
> "http://www.w3.org/2001/XMLSchema";
>    private static final String SCHEMA_SOURCE        = 
> "http://java.sun.com/xml/jaxp/properties/schemaSource";
> As detailed in the following IBM article:
> http://www-106.ibm.com/developerworks/xml/library/x-tipvalschm/
> I do know that our original xsds worked with that property, but that 
> was where we imported the java namespace into rules.xsd and used choice.
>
> I'm looking at xerces and see that it has its own properties as well.
> http://xml.apache.org/xerces-j/properties.html
> However using this property I can no longer specify the xsds as an 
> InputStream, how would I specify urls for  files that are in jars, 
> which themselves are in the classpath?
>
> Regards
>
> Mark
> George Cristian Bina wrote:
>
>> Hi Mark,
>>
>> Well, the following schemas plus instance are valid(Xerces 2.6.2). I 
>> do not know what SCHEMA_SOURCE contains in your code line:
>>
>> parser.setProperty(SCHEMA_SOURCE,( InputStream[] ) 
>> schemaList.toArray( new InputStream[0] ) );
>>
>> You may try setting a value similar with the one from schemaLocation 
>> attribute to the 
>> http://apache.org/xml/properties/schema/external-schemaLocation 
>> property.
>>
>> rules.xsd
>> =========
>>
>> <?xml version="1.0" encoding="UTF-8"?>
>> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" 
>> targetNamespace="http://drools.org/rules"
>>     elementFormDefault="qualified" 
>> xmlns:rules="http://drools.org/rules">
>>     <xs:element name="rule-set">
>>         <xs:complexType>
>>             <xs:sequence>
>>                 <xs:element minOccurs="0" maxOccurs="unbounded" 
>> ref="rules:rule"/>
>>             </xs:sequence>
>>             <xs:attribute name="name" use="required" type="xs:string"/>
>>             <xs:attribute name="description" type="xs:string"/>
>>         </xs:complexType>
>>     </xs:element>
>>     <xs:element name="rule">
>>         <xs:complexType>
>>             <xs:sequence>
>>                 <xs:element name="parameter" maxOccurs="unbounded">
>>                     <xs:complexType>
>>                         <xs:sequence>
>>                             <xs:element ref="rules:class"/>
>>                         </xs:sequence>
>>                         <xs:attribute name="identifier" 
>> use="required" type="xs:string"/>
>>                     </xs:complexType>
>>                 </xs:element>
>>                 <xs:element ref="rules:condition" 
>> maxOccurs="unbounded"/>
>>                 <xs:element ref="rules:consequence"/>
>>             </xs:sequence>
>>             <xs:attribute name="name" use="required" type="xs:string"/>
>>             <xs:attribute name="salience" type="xs:integer"/>
>>             <xs:attribute name="no-loop" type="xs:boolean"/>
>>             <xs:attribute name="description" type="xs:string"/>
>>         </xs:complexType>
>>     </xs:element>
>>     <xs:element name="class" type="xs:string" abstract="true"/>
>>     <xs:element name="condition" type="xs:string" abstract="true"/>
>>     <xs:element name="consequence" type="xs:string" abstract="true"/>
>> </xs:schema>
>>
>> java.xsd
>> ========
>>
>> <?xml version="1.0" encoding="UTF-8"?>
>> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
>>     targetNamespace="http://drools.org/semantics/java" 
>> elementFormDefault="qualified"
>>     xmlns:java="http://drools.org/semantics/java" 
>> xmlns:rules="http://drools.org/rules">
>>     <xs:import namespace="http://drools.org/rules" 
>> schemaLocation="rules.xsd"/>
>>     <xs:element name="class" type="xs:string" 
>> substitutionGroup="rules:class"/>
>>     <xs:element name="condition" type="xs:string" 
>> substitutionGroup="rules:condition"/>
>>     <xs:element name="consequence" type="xs:string" 
>> substitutionGroup="rules:consequence"/>
>> </xs:schema>
>>
>> sample.xml
>> ==========
>>
>> <?xml version="1.0" encoding="UTF-8"?>
>> <rule-set name="fibonacci" xmlns="http://drools.org/rules"
>>     xmlns:java="http://drools.org/semantics/java"
>>     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
>> xsi:schemaLocation="http://drools.org/semantics/java java.xsd 
>> http://drools.org/rules rules.xsd">
>>     <rule name="Recurse" salience="10">
>>         <parameter identifier="f">
>>
>> <java:class>org.drools.examples.fibonacci.Fibonacci</java:class>
>>         </parameter>
>>         <java:condition>f.getValue() == -1</java:condition>
>>         <java:consequence> System.err.println( "recurse for " + 
>> f.getSequence() );
>>             drools.assertObject( new Fibonacci( f.getSequence() - 1 ) 
>> ); </java:consequence>
>>     </rule>
>> </rule-set>
>>
>> Best Regards,
>> George
>> ---------------------------------------------------------------------
>> George Cristian Bina
>> <oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger
>> http://www.oxygenxml.com
>>
>>
>
>
Received on Monday, 25 October 2004 12:35:43 UTC

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