LSX-00344: namespace values differ

Question

Hello
I’am trying to implement a repository for LOM metadata (imsproject.org), the main schema imports from this one (only showing relevant parts) :
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema targetNamespace="http://www.w3.org/XML/1998/namespace"
xmlns:xsd=http://www.w3.org/2001/XMLSchema elementFormDefault="unqualified" version="1.1">
     <xsd:annotation>
          <xsd:documentation>In namespace-aware XML processors, the "xml" prefix is bound to the namespace name http://www.w3.org/XML/1998/namespace.</xsd:documentation>
          <xsd:documentation>Do not reference this file in XML instances</xsd:documentation>
     </xsd:annotation>
     <xsd:attribute name="lang" type="xsd:language">
          <xsd:annotation>
               <xsd:documentation>Refers to universal XML 1.0 lang attribute</xsd:documentation>
          </xsd:annotation>
     </xsd:attribute>
</xsd:schema>
The main then schema imports the "http://www.w3.org/XML/1998/namespace" namespace (also a simplified version):
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema targetNamespace="http://www.imsglobal.org/xsd/simple" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xdb="http://xmlns.oracle.com/xdb"
xmlns="http://www.imsglobal.org/xsd/simple" elementFormDefault="qualified" version="1.2">
<xsd:import namespace="http://www.w3.org/XML/1998/namespace" schemaLocation="http://nautilus:8080/home/DEV/xsd/ims_xml.xsd"/>
These two schemas are registered, but when I try to validate an instance, an error is raised:
DECLARE
v_xml XMLTYPE;
BEGIN
v_xml := XMLTYPE.createXML('<lom
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.imsglobal.org/xsd/simple"
xsi:noNamespaceSchemaLocation="http://nautilus:8080/home/DEV/xsd/simple.xsd">
<description> <langstring xml:lang="en">Metadata is information about an
object, be it physical or digital. As the number of objects grows
lack of information or .</langstring> <langstring xml:lang="nl">Metadata is informatie over een object. Het kan hierbij gaan om. </langstring></description>
</lom>','http://nautilus:8080/home/DEV/xsd/simple.xsd');
v_xml.SchemaValidate();
END;
ERROR at line 1:
ORA-31154: invalid XML document
ORA-19202: Error occurred in XML processing
LSX-00344: namespace values "http://www.imsglobal.org/xsd/simple" and "" differ
ORA-06512: at "SYS.XMLTYPE", line 333
ORA-06512: at line 17
Reading the info on this error it says:
“Cause: The targetNamespace specified in the schema document differed from either:”
1)     “The value of the namespace attribute identified in the import element information item.”
I think it’s not the problem:
<xsd:schema targetNamespace="http://www.w3.org/XML/1998/namespace"
xmlns:xsd=http://www.w3.org/2001/XMLSchema elementFormDefault="unqualified" version="1.1">
<xsd:import namespace="http://www.w3.org/XML/1998/namespace" schemaLocation="http://nautilus:8080/home/DEV/xsd/ims_xml.xsd"/>
2)     The value of the enclosing schema's namespace attribute
<xsd:schema targetNamespace="http://www.w3.org/XML/1998/namespace"
xmlns:xsd=http://www.w3.org/2001/XMLSchema elementFormDefault="unqualified" version="1.1">
Here is the problem and questions,
I have tried with no success (in ims_xml.xsd ):
xmlns:xml="http://www.w3.org/XML/1998/namespace
xmlns="http://www.w3.org/XML/1998/namespace
The question is: Both schemas must be of the same targetNamespace?
Any help is welcome
Thanks in advance
Mario Garcia

Answer 1

Playing around with XMLSpy, I created this doc, and with the auto-generated attributes worked fine.
But in XMLSpy the first document also worked.
<?xml version="1.0" encoding="UTF-8" ?>
- <lom xmlns="http://www.imsglobal.org/xsd/simple" xmlns:xdb="http://xmlns.oracle.com/xdb" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.imsglobal.org/xsd/simple http://nautilus:8080/home/DEV/xsd/simple.xsd">
- <description>
<langstring xml:lang="en">What's UP?</langstring>
<langstring xml:lang="es">¿Que onda?</langstring>
</description>
</lom>