The Linear Topic Map Notation  Definition and introduction,
version 1.3  By:Lars Marius Garshol Affiliation:Ontopia A/S
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. ISO is currently finishing standardization
of an alternative standardized syntax called CTM. For more
information, see the CTM home page.  Table of contents  1.
Linear topic map notation? What's that?  The Linear Topic Map
notation (LTM) is a simple textual format for topic maps. Just
like XTM, the XML interchange format, it represents the
constructs in the topic map standard as text, but unlike XTM it
is compact and simple. The notation can be written in a