Saxon

Bug initially reported by Rik Smithies:

I have XSLT code that uses the saxon:type extension, to get the schema aware type of an element, and put that as a comment into the output.

It works in Oxygen 17, which has Saxon built in. But when I tried it in the java and .net command line versions of Saxon, I had some issues.

The exception thrown in Saxon 9.6:

Error on line 17 of saxontest.xsl:
  jt:java.lang.NullPointerException: Exception thrown by extension function {public static
  net.sf.saxon.om.ZeroOrOne
  com.saxonica.functions.extfn.Extensions.typeAnnotation(net.sf.saxon.expr.XPathContext,net.sf.saxon.om.ZeroOrOne)}: java.lang.NullPointerException
  in built-in template rule
Exception thrown by extension function {public static net.sf.saxon.om.ZeroOrOne com.saxonica.functions.extfn.Extensions.typeAnnotation(net.sf.saxon.expr.XPathContext,net.sf.saxon.om.ZeroOrOne)}: java.lang.NullPointerException

In Saxon 9.5 we get the following exception:

Error on line 17 of saxontest.xsl:
  jt:java.lang.NullPointerException: Exception thrown by extension function {public static
  net.sf.saxon.value.QNameValue
  com.saxonica.functions.extfn.Extensions.typeAnnotation(net.sf.saxon.expr.XPathContext,net.sf.saxon.om.Item)}: java.lang.NullPointerException
Transformation failed: Run-time errors were reported