Add support for transactional feature relation (sampledFeature)
Remove duplicate casting
- Add HREF enum to HelperValues
- Used in GML 3.2.1 encoder return a featurePropertyType with xlink:href instead of an encoded feature, e.g. used to encode sampledFeature in SpatialSamplingFeature
Merge branch 'develop' into feature/transactional_feature_relation
Merge branch 'develop' into feature/transactional_feature_relation
Merge pull request #125 from CarstenHollmann/feature/transactional_feature_relation

Add support for transactional feature relation