Simplification of viade:points properties

Currently the viade:points property is a closed list. To make queries against this type of structure you need SPARQL 1.1 feature (e.g. properties path). Most reference libraries (rdflib,rdfstore-js) dont support full SPARQL 1.1 .I propose to modify the property to make things easier.

viade_es4c team

Start by locating the viade:points definition in the specification and compare its current closed-list semantics with the query limitations described. A contribution would need to specify the replacement property shape and update the specification with examples showing how the intended queries work without SPARQL 1.1 property paths.

Written by the indexing model from the issue text.