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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Dear Colin,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thank you for sending us the draft Abstract Event Definition Standard.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I was asked to review this from the perspective of its suitability for use within our MPS WG activities.<o:p></o:p></p><p class=MsoNormal>Our conclusion was that we can use it within our MPS Information Model to represent external events (principally Flight Dynamics predicted events, and those forming part of a CSS Schedule of ground station support), but that it does not have all the features required for our internal modelling of Planning Events, which follow a common object pattern with other Mission Planning objects, including Planning Activities, and have been defined to be consistent with the MO Message Abstraction Layer. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>There is one significant issue, however, which was identified and which Mehran has asked me to raise with you as a comment on the draft Abstract Event Standard and potential RID.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>In Table 3.1 of the document, it lists the parameters of the Abstract Event class. For the parameter “identifier” the following description is given:<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'>“Optional Parameter.<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'>An identifier that is unique for every occurrence of a particular event in a particular file<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'>NOTE – If the planning information is regenerated, then the identifier for a particular event may change.”<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The fact that the Abstract Event Identifier does not remain consistent across multiple iterations of the generated planning information is considered a serious flaw from a Mission Planning perspective as it precludes the automatic correlation of Planning Events inserted in a Plan with the updated timing of those events in the next iteration of the Navigation Event Message or CSS Schedule. We suggest that the standard should enforce that the Abstract Event Identifier for a particular event remains constant across multiple generations of the same planning information.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Best regards,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Roger Thompson<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>