def findValueTokens(name, query=None, maxDepth=None, filter=None,
    targetQuery=None, targetFilter=None, queryFactory=None,
    ignoreSearchIndex=False):
    """find token results for searchTerms.
        - name is the index name wanted for results.
        - if query is None (or evaluates to boolean False), returns the
          underlying btree data structure; which is an iterable result but
          can also be used with BTree operations
        Otherwise, same arguments as findRelationChains.
        """
