Saxon XSLT and XQuery Processor

The XML specification disallows parameter entity
references within a declaration in the internal DTD
subset, but allows them within external parameter
entities pulled into the internal DTD subset by means
of a parameter entity reference.

AElfred doesn't allow parameter entity references
within a declaration in the internal DTD subset,
whether they appear directly or whether they are
within external parameter entities pulled into the
internal DTD subset by means of a parameter entity
reference.

Present in 6.4.4 and all previous releases. (This bug
has been known about for some time and is not at all
easy to fix).