Schematron tests not compiled when XSpec is in UNC

[AirQuick]

Looks like Saxon (or Java?) does not work well with UNC and @xml:base (and resolve-uri()?).

C:\>java -version
java version "1.8.0_381"
Java(TM) SE Runtime Environment (build 1.8.0_381-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.381-b09, mixed mode)

C:\>set SAXON_CP=C:\Users\WDAGUtilityAccount\Desktop\SaxonHE12-3J\saxon-he-12.3.jar

C:\>\\localhost\C$\Users\WDAGUtilityAccount\Desktop\xspec\bin\xspec.bat -s C:\Users\WDAGUtilityAccount\Desktop\xspec\tutorial\schematron\demo-01.xspec

Converting Schematron into XSLT...
Type error in xsl:variable/@select on line 23 column 75 of preprocessor.xsl:
  XTDE0050  An empty sequence is not allowed as the value of variable $x:schematron-preprocessor
An empty sequence is not allowed as the value of variable $x:schematron-preprocessor

*** Error converting Schematron into XSLT

C:\>set SAXON_CP=C:\Users\WDAGUtilityAccount\Desktop\SaxonHE9-9-1-8J\saxon9he.jar

C:\>\\localhost\C$\Users\WDAGUtilityAccount\Desktop\xspec\bin\xspec.bat -s C:\Users\WDAGUtilityAccount\Desktop\xspec\tutorial\schematron\demo-01.xspec

Converting Schematron into XSLT...
Type error in xsl:variable/@select on line 23 column 75 of preprocessor.xsl:
  XTDE0050: An empty sequence is not allowed as the value of variable $x:schematron-preprocessor
An empty sequence is not allowed as the value of variable $x:schematron-preprocessor

*** Error converting Schematron into XSLT