[Xsltforms-support] When external schema defined, FF cannot see primitive xsd types

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On FF, when an external schema is defined, xf:bind elements with
'type' attributes having xsd-types,
i.e. "xsd:string, xsd:integer" fail to work,
and the form on initialization complains about these types with a
«Schema for namespace '' not defined for type string» msg.
(or "Schema not defined" on older revisions)

- On Chrome and (i think?) IE  external schemas work OK.
- I didn't manage to determine exactly the revision this behavior was
introduced.
The beta-2(rev260) release, on FF, although it did not work always
quite-well with external schemas,
it did *not* produce the err msg, and the attached-here test-case
xform works indeed correctly.
On rev262, the msg emerges on init, and the xsd-types ceases to work.

I include below a test-case reproducing the error, also attached as
separate files.

Regards,
  Kostis Anagnostopoulos

XForms file:
--------------------
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet href="xsltforms/xsltforms.xsl" encoding="UTF-8"
type="text/xsl"?>
<html
  xmlns="http://www.w3.org/1999/xhtml"
  xmlns:xf="http://www.w3.org/2002/xforms"
  xmlns:xsd="http://www.w3.org/2001/XMLSchema"
  xmlns:data="http://some-uri.org/data"
>
  <head>
    <title>external-schema</title>

    <xf:model id="model-main" schema="xsd.xml">

      <xf:instance id="inst-main" >
        <data:root>
            <data:item />
            <data:otherItem />
        </data:root>
      </xf:instance>

      <xf:bind id="bind-item" nodeset="/data:root/data:item"
type="data:Route" />
      <xf:bind id="bind-otherItem" nodeset="/data:root/data:otherItem"
type="xsd:string" />

    </xf:model>

  </head>

  <body>
      Item: <xf:input bind="bind-item"  incremental="true" />
      OtherItem: <xf:input bind="bind-otherItem"  incremental="true" />
  </body>
</html>

XSD file:
--------------------
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema
    elementFormDefault="unqualified"
    attributeFormDefault="unqualified"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:data="http://some-uri.org/data"
    targetNamespace="http://some-uri.org/data"
>
  <xsd:simpleType name="someInt">
    <xsd:restriction base="xsd:integer">
    </xsd:restriction>
  </xsd:simpleType>
</xsd:schema>
exa