Property:IsDefinedBy

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The attribute isDefinedBy is (rarely) used to specify URLs (or, more generally, URIs), that provide a definition of the item, usually expressed in Schema RDF Schema. This is usually only of interest if the given subject has a strict external definition, in which case the definition can be imported into SMW (see vocabulary Help:Import vocabulary) making isDefinedBy unnecessary.

This attribute is represented as rdfs:isDefinedBy (rdfs | RDF Schema) (see MediaWiki:Smw import rdfs). However, in RDF Export, article concepts already get an rdfs:isDefinedBy property.

... more about "IsDefinedBy"
Imported from"Imported from" is a predefined property that describes a relation to an imported vocabulary and is provided by Semantic MediaWiki.
Has type"Has type" is a predefined property that describes the datatype of a property and is provided by Semantic MediaWiki.