We recently had some messages about the use of minOccurs=1 and
maxOccurs=1, which was changed in version 1.1 from what was in 1.0. It was
pointed out that semantically including minOccurs=1 and maxOccurs=1 was
the same as leaving them out since they are the defaults in XML
schema. (The same goes for the data type "string"; right now xs:string is
used in most cases and is explicitly in the PREMIS schemas, but since it's
a default in XML schema, it could also be deleted. We just discovered one
place where it was left out that it should have been there for
This really goes to the question of style and there are various opinions
about this. Is it better to have a compact schema that only includes what
is needed and eliminates redundancies or to have a more verbose schema
that spells out the defaults explicitly? Either way is correct.
As we go to version 1.1, before we finalize the drafts that are out there,
it would be good if we came to consensus on this. Any opinions?