WebKB-2 accepts the language FS
which currently includes the following 3 sub-languages.
Examples for theses languages are given by two documents which are also test files:
- syntactic examples: adding, removing or searching categories and statements (simple, contextualized, ...)
- ontological examples: representing states, processes, descriptions, characteristics, time, space, ...
Other sub-languages will be added:
FE ("Formalized English" or "For English") which
is an English-like version of FCG, and
FDE ("For Document Elements") to directly
connect document elements (e.g. sentences, images, sections, whole documents)
by relations. (These sub-languages are described in a
Finally, we may add other alternatives to FCG that are less readable or expressive but more common, e.g. CGLF (Conceptual Graph Linear Format), CGIF (Conceptual Graph Interchange Format) and RDF (Resource Description Format).
A comparison of FCG, FE, CGLF, CGIF can be found in my ICCS'02 article. A comparison of these languages with RDF can be found here.
WebKB-1 accepts a variant of FS with more sub-languages.