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Hi,
I do not know what PSVI is but I think there is a little difference between
these snippets:
In the first case the child elements may occur independently from each
other. In the second case both child elements must be present if one of them
occurs.
The absence of minOccurs means 'minOccurs=1'. If one subelement is present,
the parent element occurs. In this case all child element must occurs in
accordance to their attributes.
Best regards
Joerg Moebius
-----Ursprüngliche Nachricht-----
Von: Michele Vivoda [mailto:idmichele@yahoo.it]
Gesendet: Montag, 27. März 2006 11:28
An: Michael Kay; xml-dev@lists.xml.org
Betreff: RE: [xml-dev] Occurrence Question
Thanks, I was also thinking about this option, I think
that the PSVI is the same because neither particle or
choice contribute to the PSVI, and they validate the
same instances because there is no difference between
empty and absent in xml. So, _in a choice with
elements only_ should be true that adding an optional
element makes the whole choice optional. Is this that
I wrote true, and in case, is it _always_ true, also
with other kind of particles ?
Greetings
Michele Vivoda
--- Michael Kay <mike@saxonica.com> ha scritto:
> Yes, I think they have the same meaning: they
> validate the same instances,
> and they generate the same PSVI.
>
> Michael Kay
> http://www.saxonica.com/
>
> > -----Original Message-----
> > From: Michele Vivoda [mailto:idmichele@yahoo.it]
> > Sent: 26 March 2006 19:37
> > To: xml-dev@lists.xml.org
> > Subject: [xml-dev] Occurrence Question
> >
> > Hi All,
> >
> > I would like to know if these two snippets
> > have the same 'meaning' (for xml schema):
> >
> > <xs:choice>
> > <xs:element minOccurs="0" maxOccurs="unbounded" ref="col"/>
> > <xs:element minOccurs="0" maxOccurs="unbounded"
> > ref="colgroup"/>
> > </xs:choice>
> >
> > AND
> >
> > <xs:choice minOccurs='0'>
> > <xs:element maxOccurs="unbounded" ref="col"/>
> > <xs:element maxOccurs="unbounded"
> ref="colgroup"/>
> > </xs:choice>
> >
> > Options I thought:
> >
> > 1) they express the same schema components
> > (don't think so, since min and max are
> attributes of
> > particle component)
> > 2) they express different components but these
> > components validate the same instances.
> > 3) they are different and validate different
> instances
> > (presumably
> > because the first one wants at least one
> selected
> > particle for the choice).
> > 4) In some contexts they have surely the same
> meaning,
> > in others they might not (?).
> > 5) None of the above
> >
> > Thanks
> > Michele Vivoda
> >
> >
> >
> >
> >
> >
> > ___________________________________
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> >
> >
>
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