View source for The OIAr as a semantic knowledge base

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==Introduction==
The Open Infrastructure Architecture repository (OIAr) is a knowledge management system that runs on the combination of [https://www.mediawiki.org/wiki/MediaWiki MediaWiki] (MW), and the MediaWiki extension [http://semantic-mediawiki.org/wiki/Semantic_MediaWiki Semantic MediaWiki] (SMW).

==The basis of semantic knowledge representation==
In the OIAr, many pages represent an instance of a specific concept. For instance, the page [[GF.Backup]] represents an instance of the concept [[:Category:Generic_Function|Generic Function]].

==The OIAr information model==
The knowledge items in this repository are interrelated according to the Open Infrastructure Architecture method (OIAm). This method uses the [http://www.opengroup.org/archimate/ ArchiMate] architecture modelling language to create architecture models. As a consequence, the relations between the knowledge items can be described in an ArchiMate meta-model. This meta-model is converted into a semantic representation according to the following diagram:

[[File:OIAm Information Model.png|center|650px|OIAm information model]]

''Note that relations are defined at the base of the arrow, so you can "read" them in the direction of the arrow: "Generic Pattern" "Realizes" "Generic Service"''.

This Information Model is used as the underlying structure of the OIAr and its semantic embedding in this knowledge management system:
* The ArchiMate concepts (represented by the light gray rectangles) can be found [[:Special:Categories|Categories]] in this knowledge management system. An instance of such a concept belongs to the corresponding category (e.g. [[GF.Backup|Generic Function "Backup"]] is a member of [[:Category:Generic Function]]).
* Relations between concepts are recorded as [http://semantic-mediawiki.org/wiki/Help:Properties_and_types semantic properties]; these relations can be found in [[:Property:Has ArchiMate relation with|this page]];
* There are OIAm concepts that are not relations between items, but rather attributes of an item. The most important example is the infrastructure Quality Attribute; these are registered as [[:Special:Properties|Properties]] with pre-defined values.