'Return |_SerializedRelationships| instance loaded with the
relationships contained in *rels_item_xml*. Returns an empty
collection if *rels_item_xml* is |None|.'

@staticmethod
def load_from_xml(baseURI, rels_item_xml):

    srels = _SerializedRelationships()
    if (rels_item_xml is not None):
        rels_elm = parse_xml(rels_item_xml)
        for rel_elm in rels_elm.Relationship_lst:
            srels._srels.append(_SerializedRelationship(baseURI, rel_elm))
    return srels
