JAXB 1.3 can't parse W3 SOAP 2003-05 envelope XML schema

Question

Hello,
I was trying to use JAXB to parse the MMAP schema from the SMS Forum
(http://www.smsforum.net/schemas/mmap/v1.0/mmap.xsd). I finally
tracked it down to XJC choking on the included SOAP envelope schema's
use of the xml:lang attribute for a tag called reasontext. Here's the
pared-down test case:
C:\java\src\baz>%JWSDP_HOME%\jaxb\bin\xjc.bat http://www.w3.org/2003/05/soap-envelope/soap-envelope.xsd
%JWSDP_HOME%\jaxb\bin\xjc.bat http://www.w3.org/2003/05/soap-envelope/soap-envelope.xsd
parsing a schema...
[ERROR] src-resolve: Cannot resolve the name 'xml:lang' to a(n) attribute declaration component.
  line 97 of soap-envelope.xsd
[ERROR] src-ct.0.1: Complex Type Definition Representation Error for type 'reasontext'.  Element 'attribute' is invalid, misplaced, or occurs too often.
  line 97 of soap-envelope.xsd
Failed to parse a schema.
C:\java\src\baz>I believe that the relevant portions of the schemas and namespaces in
question are:
http://www.w3.org/2003/05/soap-envelope/soap-envelope.xsd
<xs:complexType name="reasontext">
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute ref="xml:lang" use="required" />
</xs:extension>
</xs:simpleContent>
</xs:complexType>http://www.w3.org/2001/XMLSchema.xsd
<xs:complexType name="attribute" mixed="false">
<xs:complexContent>
<xs:extension base="xs:annotated">
<xs:sequence>
<xs:element name="simpleType" minOccurs="0" type="xs:localSimpleType" />
</xs:sequence>
<xs:attributeGroup ref="xs:defRef" />
<xs:attribute name="type" type="xs:QName" />
<xs:attribute name="use" use="optional" default="optional">
<xs:simpleType>
<xs:restriction base="xs:NMTOKEN">
<xs:enumeration value="prohibited" />
<xs:enumeration value="optional" />
<xs:enumeration value="required" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="default" type="xs:string" />
<xs:attribute name="fixed" type="xs:string" />
<xs:attribute name="form" type="xs:formChoice" />
</xs:extension>
</xs:complexContent>
</xs:complexType>http://www.w3.org/2001/XMLSchema.xsd
<xs:attributeGroup name="defRef">
<xs:annotation>
<xs:documentation>for element, group and attributeGroup, which both define and reference</xs:documentation>
</xs:annotation>
<xs:attribute name="name" type="xs:NCName" />
<xs:attribute name="ref" type="xs:QName" />
</xs:attributeGroup>http://www.w3.org/XML/1998/namespace
The namespace whose name is http://www.w3.org/XML/1998/namespace is
bound by definition to the prefix xml: according to Namespaces in XML,
W3C Recommendation 14 Jan 1999. Note that unlike all other XML
namespaces, both the name and the prefix are specified; i.e., if you
want XML 1.0 processors to recognize this namespace, you must use the
reserved prefix xml:.
xml:lang and xml:space
As of the last update of this document, the XML 1.0 Specification
defines two attribute names in this namespace:
xml:lang
Designed for identifying the human language used in the scope of the
element to which it's attached.
.I'm no XML schema expert, but it looks to me like "name" and "ref"
are both valid attributes for an <xs:attribute> tag and that the XML
namespace standard requires XML processors to recognize the xml:lang
attribute. Hence, this appears to me to be a bug in JAXB.
A secondary bug is that the original error message left the name of
the offending included schema blank:
C:\java\src\foo>d:\java\jwsdp\jwsdp-1.3\jaxb\bin\xjc.bat http://www.smsforum.net/schemas/mmap/v1.0/mmap.xsd
parsing a schema...
[ERROR] src-resolve: Cannot resolve the name 'xml:lang' to a(n) attribute declaration component.
  line 97 of
[ERROR] src-ct.0.1: Complex Type Definition Representation Error for type 'reasontext'.  Element 'attribute' is invalid, misplaced, or occurs too often.
  line 97 of
Failed to parse a schema.
C:\java\src\foo>In case it helps with problem diagnosis, I'm running with J2SDK 1.4.2
and have copied the endorsed jar files into the JRE lib as instructured
with JAXB:
C:\java\src\baz>java -version
java -version
java version "1.4.2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2-b28)
Java HotSpot(TM) Client VM (build 1.4.2-b28, mixed mode)
C:\java\src\baz>dir %JAVA_HOME%\jre\lib\endorsed
dir %JAVA_HOME%\jre\lib\endorsed
Volume in drive D has no label.
Volume Serial Number is 70AE-6E52
Directory of D:\java\j2se\j2sdk1.4.2\jre\lib\endorsed
03/31/2004  09:41 AM    <DIR>          .
03/31/2004  09:41 AM    <DIR>          ..
03/29/2004  01:28 PM            56,619 dom.jar
03/29/2004  01:28 PM            60,963 sax.jar
03/29/2004  01:28 PM         2,823,241 xalan.jar
03/29/2004  01:28 PM         2,667,618 xercesImpl.jar
10/10/2003  06:36 PM         1,379,810 xsltc.jar
               6 File(s)      6,989,573 bytes
               2 Dir(s)   7,889,731,584 bytes free
C:\java\src\baz>I'm quite interested in the resolution of this issue as I'm stopped in
my tracks on progress here. Help with resolution, whether in JAXB or
my usage of it, will be much appreciated. I did a search of existing
issues but didn't notice a duplicate. Thanks in advance.

Answer 1

I have also come across a similar problem with validating an xml file with an xml:lang attribute. It seems to be common across the schema validation and dtd validation. I get the following error with both schema and dtd validation:
Validation Error Msg (0): unexpected attribute "xml:lang"
Validation Error Location (0): FreeFormText
The test file extract looks like this:
<FreeFormText xml:lang="EN">Pelle</FreeFormText>
The schema defines the node as:
<xs:complexType name="FreeFormText">
          <xs:simpleContent>
               <xs:extension base="FreeFormTextType">
                    <xs:attribute name="lang" type="xs:language"/>
               </xs:extension>
          </xs:simpleContent>
</xs:complexType>
and the dtd defines the node as:
<!ELEMENT FreeFormText
     (#PCDATA)>
<!ATTLIST FreeFormText xml:lang CDATA #IMPLIED >
This looks like a bug in JAXB to me aswell. Any help on it would be much appreciated as i am also stuck.