def entity_to_id(cl, entity: ProvEntity, tree: Tree) -> str:
"""
convert a provenence entity to a [leaf] node identifier of a tree.
tree: can be a project or subproject tree
"""
try:
epath = entity.localpart.split("/")
except AttributeError:
epath = entity.identifier.localpart.split("/")
epath = ["project", "subproject"] + epath
filtfun = lambda nodeli: all([n.tag in epath for n in nodeli])
nodesli = list(tree.filter_to_leaves(filtfun))
idli = [nli[-1].identifier for nli in nodesli]
assert len(idli) == 1, "Error: Multiple paths %s match entities" % idli
return idli[0]
