Editing Topic map (section)

===Constraint standards===
It can also be desirable to define a set of constraints that can be used to guarantee or check the semantic validity of topic maps data for a particular domain. (Somewhat like [[database constraints]] for topic maps). Constraints can be used to define things like 'every document needs an author' or 'all managers must be human'. There are often implementation specific ways of achieving these goals, but work has gone into defining a standardized constraint language as follows:
* [http://www.isotopicmaps.org/tmcl/ ISO 19756: TMCL] – Topic Maps Constraint Language

TMCL is functionally similar to [[RDF Schema]] with [[Web Ontology Language]] (OWL).<ref name=Garshol>
{{cite web |url=http://ontopia.net/topicmaps/materials/tmrdf.html#N121 |title=Living With Topic Maps and RDF |author=Lars Marius Garshol |date=2003 |access-date=2014-02-21}}</ref>