Terms query template should return only instances of nb:ControlledTerm subclasses

[alyssadai]

The following query

api/app/api/utility.py

Lines 227 to 232 in 03f5d5d

	query_string = f"""
	SELECT DISTINCT ?termURL
	WHERE {{
	?termURL a {data_element_URI}.
	}}
	"""

should be made more restrictive so as to further prevent query injection (i.e., sending any URI as a parameter and getting all the instances in the graph back)

See https://github.com/neurobagel/api/blob/main/vocab/nb_vocab.ttl for subclass syntax