fix(metadata): allow to pass a string as RDF type for properties
fix(metadata): allow to pass a string as RDF type for properties

vincentchalamon/core,soyuka/core,vincentchalamon/core,api-platform/core,api-platform/core,soyuka/core,api-platform/core,soyuka/core,vincentchalamon/core,vincentchalamon/core,soyuka/core,api-platform/core