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I just found some information in notes from the review of the data
dictionary and schemas. The following comment came from someone at the
US National Archives and Records Administration:

"Should we make relatedEventSequence mandatory like
relatedObjectSequence? If there is only one event, then the sequence would
be 0"

There was a schema group that had several conference calls to review the
schemas (and some comments related to the data dictionary). It was then
changed to mandatory after a call in which the issue was discussed.

So it is intentional and not a mistake. I think the point was that if
there were more than one, a sequence must be given, and better to enforce
it rather than allow someone to leave it blank. In which case, if there is
not more than one, you just default it to 0.

Rebecca

On Mon, 6 Feb 2006, Zhiwu Xie wrote:

> Thanks a lot!
> 
> Any idea about relatedEventSequence? I think it's optionl, because not
> all related event has a sequence, and the data dictionary said so in p.
> 2-68. But both schema v1 and v1.1 said it was mandatory:
> 
> <xs:element name="relatedEventSequence" minOccurs="1" maxOccurs="1"
> type="xs:nonNegativeInteger"></xs:element>
> 
> 
> Zhiwu Xie
> 
> Graduate Research Assistant
> Research Library
> Los Alamos National Lab
> 
> On Mon, 2006-02-06 at 09:01, Rebecca S. Guenther wrote:
> > relatedEventIdentification is a container element that has 3 subelements,
> > but it is itself within the relationship container. And that is optional.
> > So IF you have a relationship expressed between your object and some other
> > object you must say what the event is that relates them (as well as other
> > information). Generally this is used for things like derivation events.
> > 
> > Rebecca
> > 
> > On Fri, 3 Feb 2006, Zhiwu Xie wrote:
> > 
> > > Sorry just search the maillist archive and got the answer.
> > > 
> > > But my searches didn't get anything about the relatedEventSequence,
> > > which is optional in the data dictionary but mandatory in the schema,
> > > both v1 and v1.1.
> > > 
> > > Zhiwu
> > > 
> > > 
> > > On Fri, 2006-02-03 at 16:15, Zhiwu Xie wrote:
> > > > relatedEventIdentification is mandatory in the data dictionary but
> > > > optional in the schema. Is it a typo in the data dictionary?
> > > > 
> > > > Thanks,
> > > > 
> > > > Zhiwu Xie
> > > > 
> > > > Graduate Research Assistant
> > > > Research Library
> > > > Los Alamos National Lab
> > > 
>