RE: [xml-dev] increment pattern for an attribute..

["Michael Kay" <mike@saxonica.com>]

> 
> I use W3C XML schema language 1.0.

Well, I assumed you were aware that what you are asking for is well beyond
the expressive power of XSDL 1.0.

Michael Kay
http://www.saxonica.com/


> 
> --- Michael Kay <mike@saxonica.com> wrote:
> 
> > You don't say what technology you are using to define the 
> schema. But 
> > let's assume it's XSDL 1.1 with assertions (and with no 
> limits on the 
> > XPath syntax allowed in assertions) - as implemented in Saxon 9.0.
> > 
> > Then I think you can do it with
> > 
> > <xs:complexType name="type-of-data-element">
> >   ...
> >   <xs:assert test="e1[1]/@val=20 and 
> >   every $e in e1[position()>1] satisfies $e/@val = 
> > $e/preceding-sibling::e1/@val + 1"/> </xs:complexType>
> > 
> > I'm not sure this is quite right according to your description - 
> > perhaps you allow gaps in the numbering sequence. In that case
> > it's:
> > 
> > <xs:assert test="e1[1]/@val=20 and
> > every $e in e1[position()>1] satisfies $e/+@val > 
> > $e/preceding-sibling::e1/+@val"/>
> > 
> > (The odd little "+" signs are a quirky way of forcing 
> conversion to a 
> > number in XPath 2.0)
> > 
> > Give it a try and let us know if it works.
> > 
> > Michael Kay
> > http://www.saxonica.com/
> > 
> > > 	
> > > I need to define the schema for "val" attribute in
> > the below XML:
> > > 
> > > <data term="EXP">
> > > <el val="20">
> > > <ch> some data </ch>
> > > </el>
> > > <el val="21">
> > > <ch> some data </ch>
> > > </el>
> > > .....similarly for val=22,23,24,....N </data>
> > > 
> > > <data term="SUPP">
> > > <el val="20">
> > > <ch> some data </ch>
> > > </el>
> > > <el val="21">
> > > <ch> some data </ch>
> > > </el>
> > > .....similarly for val=22,23,24,....N </data>
> > > 
> > > Here, am more interested in the "val" attribute of
> > "el" 
> > > element. What is the Specific schema for "val"
> > > attribute which satisfies the following
> > conditions:
> > > 1. allowed values for "val" are 20,21,22,..... N
> > (no limit on
> > > N although it's typically < 100.) 2. "val" always
> > begins with
> > > 20 in each "data" element scope.
> > > 3. "val" must be in ascending order
> > (20,21,22...etc) 4. "val" 
> > > must be unique in each "data" element scope.
> > > 
> > > appreciate any pointers.
> > > +D
> > > 
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