This file is indexed.

/usr/share/postgresql/10/extension/xml2--1.0--1.1.sql is in postgresql-10 10.6-0ubuntu0.18.04.1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/* contrib/xml2/xml2--1.0--1.1.sql */

-- complain if script is sourced in psql, rather than via ALTER EXTENSION
\echo Use "ALTER EXTENSION xml2 UPDATE TO '1.1'" to load this file. \quit

ALTER FUNCTION xml_valid(text) PARALLEL SAFE;
ALTER FUNCTION xml_encode_special_chars(text) PARALLEL SAFE;
ALTER FUNCTION xpath_string(text, text) PARALLEL SAFE;
ALTER FUNCTION xpath_nodeset(text, text, text, text) PARALLEL SAFE;
ALTER FUNCTION xpath_number(text, text) PARALLEL SAFE;
ALTER FUNCTION xpath_bool(text, text) PARALLEL SAFE;
ALTER FUNCTION xpath_list(text, text, text) PARALLEL SAFE;
ALTER FUNCTION xpath_list(text, text) PARALLEL SAFE;
ALTER FUNCTION xpath_nodeset(text, text) PARALLEL SAFE;
ALTER FUNCTION xpath_nodeset(text, text, text) PARALLEL SAFE;
ALTER FUNCTION xpath_table(text, text, text, text, text) PARALLEL SAFE;
ALTER FUNCTION xslt_process(text, text, text) PARALLEL SAFE;
ALTER FUNCTION xslt_process(text, text) PARALLEL SAFE;