'Return XML string based on settings accumulated via method calls.'

@property
def xml(self):

    xml = ('<Relationships    xmlns="%s">\n' % NS.OPC_RELATIONSHIPS)
    for (rId, reltype, target, target_mode) in self._rels:
        xml += a_Relationship().with_rId(rId).with_reltype(reltype).with_target(target).with_target_mode(target_mode).with_indent(2).without_namespace().xml
    xml += '</Relationships>\n'
    return xml
