[sdo] ISSUE 148: Specify ChangeSummary serialization format forarrays and Sequences

["Radu Preotiuc-Pietro" <radu.preotiuc-pietro@oracle.com>]

Even though SDO 2.1.1 defines a format for serializing many-valued properties and sequenced DataObjects as part of a ChangeSummary, this is not enforced, see chapter "11 Change Summary XML format":
Note: For serialization of ChangeSummary information in case of many-valued properties or sequenced objects, implementations are allowed to follow a different format than the one described in this document, if interoperability is not required.

We need to come up with some format that is acceptable to all parties, to ensure on-the-wire compatibility.

Radu