Remove unused namespace.

Author: RaMisess

core/esmf-test-aspect-models/src/main/resources/valid/samm_2_0_0/org.eclipse.esmf.test/1.0.0/AspectWithOptionalPropertyAndConstraint.ttl

@@ -13,7 +13,6 @@
 @prefix samm: <urn:samm:org.eclipse.esmf.samm:meta-model:2.0.0#> .
 @prefix samm-c: <urn:samm:org.eclipse.esmf.samm:characteristic:2.0.0#> .
 @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
-@prefix unit: <urn:bamm:io.openmanufacturing:unit:2.0.0#> .
 
 :AspectWithOptionalPropertyAndConstraint a samm:Aspect ;
    samm:properties ( [ samm:property :stringProperty; samm:optional true ] ) ;