Question regarding nif:occurrence and linking to lemon

Hi,

For the OntoLex spec we are interested in specifying how we can link
dictionaries and similar resources to corpora specified NIF, so we can
represent, for example, corpora annotated with WordNet synsets. The
guidelines are here

https://www.w3.org/community/ontolex/wiki/Final_Model_Specification#OpenAnnotation_and_NIF

I had assumed that the property 'occurrence' given in the diagram here
would be used:

http://persistence.uni-leipzig.org/nlp2rdf/ontologies/nif-core/nif-core.html#

However, it seems that this property is not in fact in the NIF spec and
that the diagram is out-of-date. Is there any comment from the NIF
community on how this linking should be realized?

Regards,
John