RE: increment pattern for an attribute..
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/@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/@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 > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection > around http://mail.yahoo.com > > ______________________________________________________________ > _________ > > XML-DEV is a publicly archived, unmoderated list hosted by > OASIS to support XML implementation and development. To > minimize spam in the archives, you must subscribe before posting. > > [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/ > Or unsubscribe: xml-dev-unsubscribe@l... > subscribe: xml-dev-subscribe@l... List archive: > http://lists.xml.org/archives/xml-dev/ > List Guidelines: http://www.oasis-open.org/maillists/guidelines.php >
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