datatypeLibrary attributes on ancestor div elements are not picked up by data elements when resolving their datatype library.

Attached below is a schema and (valid) xml file which reproduce the problem. As of 2.9.2 the schema fails to compile, though it is valid and should match the xml file:

    $ xmllint --relaxng /tmp/datatypeLibrary-div-bug.rng /tmp/datatypeLibrary-div-bug.xml
    /tmp/datatypeLibrary-div-bug.rng:10: element data: Relax-NG parser error : Error type 'anyURI' is not exported by type library 'http://relaxng.org/ns/structure/1.0'
    Relax-NG schema /tmp/datatypeLibrary-div-bug.rng failed to compile
    <?xml version="1.0"?>
    <abc bar="/a/url"/>

I wonder if div elements are being stripped (per section 4.11 of the spec) before the datatypeLibrary attributes get inherited and stripped (per section 4.3).


datatypeLibrary-div-bug.rng:
    <?xml version="1.0"?>
    <grammar xmlns="http://relaxng.org/ns/structure/1.0">

        <!-- The datatypeLibrary attribute here doesn't get picked up by the inner 
                 data element. -->
        <div datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
            <define name="foo">
                <element name="abc">
                    <attribute name="bar">
                        <data type="anyURI"/>
                    </attribute>
                </element>
            </define>
        </div>

        <start>
            <ref name="foo"/>
        </start>
    </grammar>


datatypeLibrary-div-bug.xml:
    <abc bar="/a/url"/>