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This ticket to find out and perhaps add test case(s) to cover it. Also documentation (solr/CHANGES.txt?) update if it is not (yet) supported.
SOLR-7212: Parameter substitution across whole request SOLR-839: XML Query Parser support (deftype=xmlparser)
SOLR-7212 Parameter substitution across whole request
SOLR-839 XML Query Parser support (deftype=xmlparser)