From
http://www.isotopicmaps.org/TMRM/TMRM-7.0/tmrm7.pdf The Topic Maps family of standards is designed to facilitate the gathering of all the information
about a subject at a single location. The information about a subject includes its relationships
to other subjects; such relationships may also be treated as subjects (subject-centric).
ISO/IEC 13250-2 (TMDM, Topic Maps Data Model) provides a foundation for syntaxes and
notations, such as those defined in ISO/IEC 13250-3 Topic Maps XML Syntax and ISO/IEC
13250-4 Topic Maps Canonicalization. Of necessity, the TMDM makes ontological commitments in terms of how particular subjects are identified (topics, associations, occurrences), what
properties are required, the tests to be used to determine whether two or more proxies represent
the same subject, and other matters.
In the SolrSherlock project, we are using 13250-5, the reference model as our guide. We do not use the data model.