Saxon

The rules for xs:import in XSD 1.1 part 1 section 4.2.6.2 say

3 If D2 [the target document] exists, that is, clause 2.1 or clause 2.2 above were satisfied, then the appropriate case among the following must be true:
3.1 If there is a namespace [attribute], then its ·actual value· is identical to the ·actual value· of the targetNamespace [attribute] of D2.
3.2 If there is no namespace [attribute], then D2 has no targetNamespace [attribute]

xsl:import-schema effectively inherits these rules, because the semantics of xsl:import-schema are described in terms of an equivalent "synthetic schema document" using xs:import.

I believe we are not detecting condition 3.2, that is, the case where xsl:import-schema specifies no namespace attribute, and the referenced schema document has a targetNamespace. New test case import-schema-201 confirms this.

For xs:import itself, we get this right - as shown by new test case target007 in XSD test set targetNS.

Possible reason, in SchemaCompiler.processSchemaDocument(), it gets tangled up with the rules for chameleon include.

This is a spin-off of bug #3925