This technical report defines version 1.3 of the Linear Topic Map Notation, also known as LTM. It provides both an introduction and a formal definition, the latter in the form of a complete EBNF specification given in section 3.

Please note that this document is not a formal specification from any recognized standards body, but a Technical Report published by Ontopia, a commercial company, for the convenience of all interested parties. The specification may be taken up by some standards body at some point, but nothing suggests that this will happen soon.