[WIP] Fix up patterns test to XSpec @href for files

Per @wendellpiez, this approach is supported in XSpec with @href on a variable instead
of using document('../rel/path/file/xml') using pure XSLT for these kinds of dynamic
relative pathing issues in the test suite.

src/schema-gen/InspectorXSLT/testing/tests/inspector-functional-xspec/xspec-patterns.xspec

@@ -55,7 +55,7 @@ Modes to test:
    </x:scenario>
 
    <x:scenario label="[B] A simple but valid document (element) copies through">
-      <x:variable name="valid-file" select="document('../../../computer-valid/valid1.xml')"/>
+      <x:variable name="valid-file"  href="../../computer-valid/valid1.xml"/>
       <x:scenario label="[B.1] - A 'computer' document">
          <!--  selecting '/' passes the root of the tree in as wanted, instead of the element alone. -->
          <x:context select="/">