- From: Michael Kay <mike@saxonica.com>
- Date: Fri, 29 May 2009 16:55:26 +0100
- To: "'Costello, Roger L.'" <costello@mitre.org>, <xmlschema-dev@w3.org>
There are no constraints on how many elements you can have matching the open content. So, if you like, it's effectively minOccurs="0" maxOccurs="unbounded". Regards, Michael Kay http://www.saxonica.com/ http://twitter.com/michaelhkay > -----Original Message----- > From: xmlschema-dev-request@w3.org > [mailto:xmlschema-dev-request@w3.org] On Behalf Of Costello, Roger L. > Sent: 29 May 2009 16:50 > To: 'xmlschema-dev@w3.org' > Subject: RE: [XML Schema 1.1] Many questions about openContent > > > Thanks Michael. > > So the <any> element within an <openContent> is always > (effectively) minOccurs="1" and maxOccurs="1". Correct? > > That is, it is effectively this: > > <element name="Book"> > <complexType> > <openContent mode="interleaved"> > <any minOccurs="1" maxOccurs="1" /> > </openContent> > <sequence> > <element name="Title" type="string"/> > <element name="Author" type="string" /> > <element name="Date" type="string"/> > <element name="ISBN" type="string"/> > <element name="Publisher" type="string"/> > </sequence> > </complexType> > </element> > > Correct? > > Now, what does that mean? > > Does it mean that 1 new element *must* be inserted into the > <sequence> content model? Or, does it mean that: > > Before the <Title> element there *must* be 1 new element, and > Before the <Author element there *must* be 1 new element, and > Before the <Date> element there *must* be 1 new element, and > Before the <ISBN> element there *must* be 1 new element, and > Before the <Publisher> element there *must* be 1 new element, and > After the <Publisher> element there *must* be 1 new element. > > > And what about mode="suffix": > > <element name="Book"> > <complexType> > <openContent mode="suffix"> > <any /> > </openContent> > <sequence> > <element name="Title" type="string"/> > <element name="Author" type="string" /> > <element name="Date" type="string"/> > <element name="ISBN" type="string"/> > <element name="Publisher" type="string"/> > </sequence> > </complexType> > </element> > > Does this mean that 1 new element must always be placed at > the bottom of the <sequence> content model (after the > <Publisher> element)? > > /Roger > > > > > -----Original Message----- > > From: Michael Kay [mailto:mike@saxonica.com] > > Sent: Friday, May 29, 2009 11:39 AM > > To: Costello, Roger L.; xmlschema-dev@w3.org > > Subject: RE: [XML Schema 1.1] Many questions about openContent > > > > > > On the first question, the schema component model for open content > > does not include a minOccurs and maxOccurs value (the {open > content} > > property is a wildcard, not a wildcard particle). As far as > I can see, > > it is permitted to specify these values in the XML > representation, but > > they are ignored. > > Perhaps they should not be allowed: I'll raise a bug to > propose this. > > > > On the second question, mode="none" is used in the same way as > > use="prohibited" on attributes, to suppress inheritance of > openContent > > in a type that would otherwise acquire it automatically. > > > > Regards, > > > > Michael Kay > > http://www.saxonica.com/ > > http://twitter.com/michaelhkay > > > > > > > > > -----Original Message----- > > > From: xmlschema-dev-request@w3.org > > > [mailto:xmlschema-dev-request@w3.org] On Behalf Of > > Costello, Roger L. > > > Sent: 29 May 2009 16:23 > > > To: 'xmlschema-dev@w3.org' > > > Subject: [XML Schema 1.1] Many questions about openContent > > > > > > > > > Hi Folks, > > > > > > Here is an example of declaring a <Book> element with > open content: > > > > > > <element name="Book"> > > > <complexType> > > > <openContent mode="interleaved"> > > > <any minOccurs="..." maxOccurs="..." /> > > > </openContent> > > > <sequence> > > > <element name="Title" type="string"/> > > > <element name="Author" type="string" /> > > > <element name="Date" type="string"/> > > > <element name="ISBN" type="string"/> > > > <element name="Publisher" type="string"/> > > > </sequence> > > > </complexType> > > > </element> > > > > > > Notice that I left unspecified the value of minOccurs and > maxOccurs > > > on the <any> element. > > > > > > If I specify minOccurs="0" and maxOccurs="1" does it mean > that 0-1 > > > new elements can be inserted into the <sequence> content > model? Or, > > > does it mean that: > > > > > > Before the <Title> element there can be 0-1 new elements, and > > > Before the <Author element there can be 0-1 new elements, and > > > Before the <Date> element there can be 0-1 new elements, and > > > Before the <ISBN> element there can be 0-1 new elements, and > > > Before the <Publisher> element there can be 0-1 new > elements, and > > > After the <Publisher> element there can be 0-1 new elements. > > > > > > If I specify minOccurs="1" and maxOccurs="1" does it mean > that 1 new > > > element must be inserted into the <sequence> content > model? Or, does > > > it mean that: > > > > > > Before the <Title> element there must be 1 new element, and > > > Before the <Author element there must be 1 new element, and > > > Before the <Date> element there must be 1 new element, and > > > Before the <ISBN> element there must be 1 new element, and > > > Before the <Publisher> element there must be 1 new element, and > > > After the <Publisher> element there must be 1 new element. > > > > > > If I specify minOccurs="0" and maxOccurs="unbounded" does it mean > > > that 0-unbounded new elements can be inserted into the <sequence> > > > content model? Or, does it mean that: > > > > > > Before the <Title> element there can be 0-unbounded > new elements, > > > and > > > Before the <Author element there can be 0-unbounded > new elements, > > > and > > > Before the <Date> element there can be 0-unbounded new > elements, > > > and > > > Before the <ISBN> element there can be 0-unbounded new > elements, > > > and > > > Before the <Publisher> element there can be 0-unbounded new > > > elements, and > > > After the <Publisher> element there can be 0-unbounded new > > > elements. > > > > > > > > > Next, suppose I change the mode to 'suffix': > > > > > > <element name="Book"> > > > <complexType> > > > <openContent mode="suffix"> > > > <any minOccurs="..." maxOccurs="..." /> > > > </openContent> > > > <sequence> > > > <element name="Title" type="string"/> > > > <element name="Author" type="string" /> > > > <element name="Date" type="string"/> > > > <element name="ISBN" type="string"/> > > > <element name="Publisher" type="string"/> > > > </sequence> > > > </complexType> > > > </element> > > > > > > I believe mode="suffix" means that new elements must always be > > > placed at the bottom of the <sequence> content model (after the > > > <Publisher> element). Correct? > > > > > > If I specify minOccurs="0" and maxOccurs="1" does it mean > that 0-1 > > > new elements can be inserted at the bottom of the > <sequence> content > > > model? > > > > > > If I specify minOccurs="1" and maxOccurs="1" does it mean > that 1 new > > > element must be inserted at the bottom of the <sequence> content > > > model? > > > > > > If I specify minOccurs="0" and maxOccurs="unbounded" does it mean > > > that 0-unbounded new elements can be inserted at the > bottom of the > > > <sequence> content model? > > > > > > > > > Lastly, suppose I change the mode to 'none': > > > > > > <element name="Book"> > > > <complexType> > > > <openContent mode="none"> > > > <any minOccurs="..." maxOccurs="..." /> > > > </openContent> > > > <sequence> > > > <element name="Title" type="string"/> > > > <element name="Author" type="string" /> > > > <element name="Date" type="string"/> > > > <element name="ISBN" type="string"/> > > > <element name="Publisher" type="string"/> > > > </sequence> > > > </complexType> > > > </element> > > > > > > What does mode="none" mean? Does it mean: > > > > > > You cannot insert new elements into the <sequence> > > content model. > > > > > > How is it different from this (no openContent specified): > > > > > > <element name="Book"> > > > <complexType> > > > <sequence> > > > <element name="Title" type="string"/> > > > <element name="Author" type="string" /> > > > <element name="Date" type="string"/> > > > <element name="ISBN" type="string"/> > > > <element name="Publisher" type="string"/> > > > </sequence> > > > </complexType> > > > </element> > > > > > > Are they the same? If they are, why have mode="none"? What's its > > > value? > > > > > > /Roger > > > >
Received on Friday, 29 May 2009 15:56:01 UTC