Mapping (in the form of associative list) from stanza postmarks to type declarations.
Keys in the map are usually only those prescribed by the CUDF specification, namely "preamble", "package", and "request". Values in the map are type declarations for each supported property of that stanza; usually they only represent core property schemata (see CUDF §2.2.3).
Default stanza types for parsing CUDF documents.
For what concerns package stanzas, available types can be extended by using "property" declaration in the preamble stanza.