JAXB binding XBRL element does not work - eclipse

Question

I am trying to generate localised XBRL classes with JAXB in Eclipse, but I have been getting an error:
[ERROR] Property "Title" is already defined. Use <jaxb:property> to resolve this conflict.
line 145 of http://www.xbrl.org/2003/xl-2003-12-31.xsd
[ERROR] The following location is relevant to the above error
line 151 of http://www.xbrl.org/2003/xl-2003-12-31.xsd
As the error suggests, an element and an attribute name conflicts. These are lines 145 and 151:
<element ref="xl:title" minOccurs="0" maxOccurs="unbounded" />
<attribute ref="xlink:title" use="optional" />
So I'd need to rename either (or both). This is what I've been trying to do - bind the element title to titleElement:
<jxb:bindings version="1.0"
xmlns:jxb="http://java.sun.com/xml/ns/jaxb"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xl="http://www.xbrl.org/2003/XLink"
schemaLocation="http://www.xbrl.org/2003/xl-2003-12-31.xsd">
<jxb:bindings node="//element[#ref='xl:title']">
<jxb:property ref="xl:titleElement"/>
</jxb:bindings>
</jxb:bindings>
This produces the following error, plus the original "title already defined" errors:
[ERROR] XPath evaluation of "//element[#ref='xl:title']" results in empty target node
line 6 of titleElementAttributeFixer.xjb
Suggestions to get it working?
EDIT: as helderdarocha suggested, my expression was wrong. I am new to XML and XPath, and it was a bit confusing since the element does not have the "xs:" namespace typed excplicitly. After I fixed that error, I got another one:
[ERROR] XPath evaluation of "//xs:element[#ref='xl:title']" results in too many (3) target nodes
As all the "ref" attributes need to be updated, I put the tag "multiple='true'" in the binding. Now I am getting the following error, and cannot figure out how to solve it:
[ERROR] cvc-complex-type.3.2.2: Attribute 'ref' is not allowed to appear in element 'jxb:property'.
Ideas for this? I do want to bind the contents in the attribute 'ref' for the element in question to another name.

Answer 1

I solved the problem after all by applying these SO questions:
JAXB fails to generate Java classes for XBRL
JAXB XJC Two declarations cause a collision. Customized binding cannot be honored
So after I solved the original problem, I had additional problems with objectfactory collisions, which I fixed as well. This is how my working bindings.xjb looks in general:
<bindings xmlns="http://java.sun.com/xml/ns/jaxb"
xmlns:xsi="http://www.w3.org/2000/10/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:xjc="http://java.sun.com/xml/ns/jaxb/xjc"
version="2.1">
<bindings schemaLocation="http://www.xbrl.org/2003/xl-2003-12-31.xsd"
node="//xsd:schema//xsd:element[#name='title']">
<property name="xlTitle"/>
</bindings>
<bindings schemaLocation="<local_dimension_file_D002>.xsd"
node="//xsd:schema//xsd:element[#name='AcceleratedDepreciation']">
<factoryMethod name="AcceleratedDepreciationD002"/>
</bindings>
...many more objectfactory collisions solved...
</bindings>
I hope this helps other XBRL/XML/JAXB newcomers to get started.

Answer 2

Your XPath expression is incorrect. Your bindings XML declares an xs prefix to qualify all XML Schema elements, but your XPath expression tries to find an element element from no-namespace since it's not qualified.
You should use:
<jxb:bindings node="//xs:element[#ref='xl:title']">
<jxb:property ref="xl:titleElement"/>
</jxb:bindings>