Latest available version). (See list of available previous versions below.)
A Mathematical Formalism for the Topic Maps Reference Model contributed by Neill A. Kipp (ISO/IEC JTC1/SC34 N0441).
The guide to the topic maps standards, which outlines current efforts with respect to topic map standardization work. This should help you understand how the Topic Maps Reference Model fits into the big picture. (Briefly, the big picture is that the Reference Model provides concepts and terms for discussing and disclosing TM Applications in general, including the Standard Application, while the Standard Application, with its powerful ontological notions of topic names, topic occurrences, and user-defined associations among topics, is the centerpiece of most current work in the arena of Topic Maps.)
Topic Maps Reference Model (TMRM):
Version 6.0 (2006-03-01) PDF.
Version 5.0 (2005-02-12) in HTML
(also available with ISO/IEC boilerplate as printable PDF).
Version 2.30 (2003/03/28) (aka ISO/IEC JTC1/SC34/WG3 N0393)
Topic Maps -- Reference Model Use Cases:
Topic Maps -- Reference Model Use Cases (ISO/IEC JTC1/SC34 N0490 (2004-03-20)).
Topic Maps Reference Model: Requirements
HTTPGET Topic Map Application Definition:
TMASD Topic Map Application Definition:
Draft Alignment of N0396 with N0393 (TMSM):
Simple Topic Maps (STM):