node_filter = Filter(allowed_fields, node_filter)
sql += " AND (%s) %s" % node_filter.sql(api, "AND")
elif isinstance (node_filter, StringTypes):
node_filter = Filter(allowed_fields, node_filter)
sql += " AND (%s) %s" % node_filter.sql(api, "AND")
elif isinstance (node_filter, StringTypes):