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+To add the custom functions to your MySQL server use the following syntax:
+(you may install only the functions you need):
+
+USE mysql;
+
+DROP FUNCTION IF EXISTS lib_mysqludf_xql_info;
+DROP FUNCTION IF EXISTS xql_textdecl;
+DROP FUNCTION IF EXISTS xql_pi;
+DROP FUNCTION IF EXISTS xql_dtd;
+DROP FUNCTION IF EXISTS xql_element;
+DROP FUNCTION IF EXISTS xql_forest;
+DROP FUNCTION IF EXISTS xql_concat;
+DROP FUNCTION IF EXISTS xql_agg;
+DROP FUNCTION IF EXISTS xql_comment;
+DROP FUNCTION IF EXISTS xql_cdata;
+DROP FUNCTION IF EXISTS xql_encode;
+
+CREATE FUNCTION lib_mysqludf_xql_info RETURNS STRING SONAME 'lib_mysqludf_xql.so';
+CREATE FUNCTION xql_textdecl RETURNS STRING SONAME 'lib_mysqludf_xql.so';
+CREATE FUNCTION xql_pi RETURNS STRING SONAME 'lib_mysqludf_xql.so';
+CREATE FUNCTION xql_dtd RETURNS STRING SONAME 'lib_mysqludf_xql.so';
+CREATE FUNCTION xql_element RETURNS STRING SONAME 'lib_mysqludf_xql.so';
+CREATE FUNCTION xql_forest RETURNS STRING SONAME 'lib_mysqludf_xql.so';
+CREATE FUNCTION xql_concat RETURNS STRING SONAME 'lib_mysqludf_xql.so';
+CREATE AGGREGATE FUNCTION xql_agg RETURNS STRING SONAME 'lib_mysqludf_xql.so';
+CREATE FUNCTION xql_comment RETURNS STRING SONAME 'lib_mysqludf_xql.so';
+CREATE FUNCTION xql_cdata RETURNS STRING SONAME 'lib_mysqludf_xql.so';
+CREATE FUNCTION xql_encode RETURNS STRING SONAME 'lib_mysqludf_xql.so';
+
+Example for deinstalling a function:
+DROP FUNCTION xql_encode;
+
+For function descriptions, see the following webpage:
+http://http://www.mysqludf.org/lib_mysqludf_xql/index.php