make WWW_Find work again, now that its ML modules reside within a theory context (cf. bf5b45870110) -- patch by Rafal Kolanski;
<?xml version="1.0"?>
<locatingRules xmlns="http://thaiopensource.com/ns/locating-rules/1.0">
<uri resource="pgip_isar.xml" uri="pgip.rnc"/>
<uri resource="pgip_isar.xml" typeId="RELAX NG"/>
</locatingRules>