Add DefinedTerm use case

pages/_useCases/DefinedTerm.md

@@ -0,0 +1,32 @@
+---
+layout: use-case
+name: DefinedTerm
+group: Dataset
+active: true
+redirect_from:
+- "/useCases/DefinedTerm/"
+- "/useCases/DefinedTerm"
+---
+
+The SchemaOrg type DefinedTerm is allowed in many places as property value.
+
+In e.g. the life-sciences, there are a number of controlled vocabularies
+and ontologies, which are often used as source of the `DefinedTerms`.
+Many of them can be browsed and accessed through terminology and lookup services or portals.
+
+For linked data applications it is sufficient for an entity
+with `@type="DefinedTerm"` to link to an `@id` pointing to the IRI
+of the referenced concept. In other cases, more information is needed to search and view defined term information
+without having to lookup external resources. Those use cases are the target of this profile.
+E.g., a domain-specific search engine
+can create faceted search based on the `name` property, like e.g. done in TeSS.
+Aforementioned terminology services also offer linking and query interfaces
+beyond IRIs as parameters.
+
+Another possible use of a conformant `DefinedTerm`
+is to enable creating hyperlinks to other web ressources, e.g.
+https://bio.tools/t?inputDataFormatID=%22format_3244%22
+or provide tool-tips if the `description` is provided.
+
+It is not intended to duplicate the content and expressivity
+of powerful ontology representations and serialisations like OWL or RDF.