def _from_catalog(self):
        if self.dbconn.version < 90100:
            return
        for coll in self.fetch():
            self[coll.key()] = coll
Initialize the dictionary of collations by querying the catalogs
dataset/ETHPy150Open perseas/Pyrseas/pyrseas/dbobject/collation.py/CollationDict._from_catalog