(Mixed Object:Document Content Architecture) An IBM compound document format for text and graphics elements in a document. It supports Revisable Documents, which are editable like revisable-form DCA, Presentation Documents, which provide specific output formatting similar to DCA final-form, and Resource Documents, which hold control information such as fonts.

Formats for specific objects are specified in OCAs (Object Content Architectures): PTOCA for Presentation and Text that has been formatted for output, GOCA for vector Graphics objects, IOCA for bitmapped Images and FOCA for Fonts. MO:DCA is implemented as IBM's AFP page description language.