4 Extended types ('xtypes') are user-defined data types equipped with mechanisms
5 for parsing and printing.
7 Each xtype is described by a <<struct_xtype,`struct xtype`>>, which contains properties of the type
8 and several pointers to callback functions.
10 Xtypes are currently supported by the following modules:
12 * <<table:,Table printer>>
13 * <<opt:,Command-line option parser>>
14 * <<conf:,Configuration parser>>