PI data may not contain ?>, which would terminate the instruction early. The
serializer emitted it raw, producing malformed output. Insert a space between
an offending ? and > (XSLT 1.0 7.3 recovery: a processor recovers from a
generated ?> by inserting a space after the ?), via a shared Escaping helper
applied at both XML PI serialization sites. A trailing ? is left alone.
Closes Apache Xalan conformance case output72.
Mihaela Mihaljevic
f1bc46e99b