collection object for aliasing attributes
delete in before suite for test_schemaless
test for aliasing attributes - work prior to changing subproperty of internals
run equivalient predicates if an aliased attribute is included
closure of properties in queried graph
query rewritting
eliminate subp rule
use equivalent predicates in queries - rewrite subp reasoning
due to a potential bug in query engine - avoid reseting nil values
same resetting bug applies to read only
rdfs label not taken for alias
rdfs label test corrections
include itself in the equivalent predicat  bundle
reuse filters