This file is indexed.

/usr/share/postgresql/9.5/extension/xml2.control is in postgresql-contrib-9.5 9.5.2-1.

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The actual contents of the file can be viewed below.

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# xml2 extension
comment = 'XPath querying and XSLT'
default_version = '1.0'
module_pathname = '$libdir/pgxml'
# non-relocatable because xml2--unpackaged--1.0.sql needs to use @extschema@
relocatable = false