Can't instantiate LDPSerializer without Meta args

The LDPSerializer is not in fact an extension of Serializer but of HyperlinkedModelSerializer

As such it is not possible to use it outside of this context, and without the full Meta args, whilst in DRF it's common to produce serializers like so:

my_serializer = LDPSerializer(user, data=request.POST)

LDPSerializer cannot be used in this way. It must be done like so:

meta_args = {'model': Invoice, 'depth': 2, 'fields': ("@id", "title", "batches", "date")}
meta_class = type('Meta', (), meta_args)
serializer_class = type(LDPSerializer)('InvoiceSerializer', (LDPSerializer,), {'Meta': meta_class})
serializer = serializer_class(data=invoice)

The current LDPSerializer should be renamed LDPModelSerializer, reflecting its relationship to the Rest Framework base class

Another class should be provided LDPSerializer, which extends Serializer. It should only be concerned with extending the LDPSerializer to allow a resource to be serialized in LDP format without all the "automatic-ness" in the LDPModelSerializer