Hi Alex,
At 11.08 23/05/2005 -0400, Alex Nelson wrote:
Alberto,
Thank you for your reply. Where would I find the documentation that
you mentioned? I looked in xerces-c.pdf and didn't find anything
relevant. I looked at http://www.w3.org/TR/xmlschema-1/#components in
section 3.11.6 and found some possibly relevant stuff, but not the
restrictions that you mention.
Yes, � 3.11.6 is the section that defines what is legal; in the "Schema
Component Constraint: Fields Value OK", point 2.2 it says "It must be an
XPath expression involving the child and/or attribute axes whose
abbreviated form is as given above".
There is a link to what is legal for
XPath which I followed to http://www.w3.org/TR/1999/REC-xpath-19991116
That is the spec for the full XPath: XMLSchema parsers will only understand
what is in the XMLSchema specs.
The text there seems to imply that I can use (as you suggest)
child::id
but that doesn't give me the validation error that want. Again, I can only
seem to generate the validation error with
child::*
The XPath expression you are writing doesn't reach the id element, as it is
executed starting from the tags element; try writing "tag" in the selector,
and "id" in the field.
Alberto
How would I generate the uniq constraint only on the id node?
This is what I tried; shouldn't it give the validation failure?
I tried both with and without parens: child::id and child::id().
<?xml version="1.0"?>
<xs:schema
xmlns:xs="http://www.w3.org/2001/XMLSchema";
targetNamespace="TStreams"
xmlns="TStreams"
elementFormDefault="qualified">
<xs:element name="tags">
<xs:complexType>
<xs:sequence>
<xs:element name="tag" type="TagType" maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
<xs:unique name="uniqueTag">
<xs:selector xpath="child::id()" />
<xs:field xpath="."/>
</xs:unique>
</xs:element>
<xs:complexType name="TagType">
<xs:all>
<xs:element name="id" type="xs:int" />
</xs:all>
</xs:complexType>
</xs:schema>
On Saturday 21 May 2005 4:43 am, you wrote:
> [ http://issues.apache.org/jira/browse/XERCESC-1422?page=all ]
>
> Alberto Massari resolved XERCESC-1422:
> --------------------------------------
>
> Resolution: Invalid
>
> Hi Alex,
> the XPath expressions you can put in the identity constraint are limited
> (see � 3.11.6 of the specs): only 'child' and 'attribute' axis, and no
> special functions like node() (btw, you missed the parenthesis). So, the
> only correct form is child::id (or just id)
>
> Alberto
>
> > uniq constraint validation broken?
> > ----------------------------------
> >
> > Key: XERCESC-1422
> > URL: http://issues.apache.org/jira/browse/XERCESC-1422
> > Project: Xerces-C++
> > Type: Bug
> > Components: Validating Parser (Schema) (Xerces 1.5 or up only)
> > Versions: 2.6.0
> > Environment: Downloaded xerces-C++ version 2.6.0, built from sources
> > using g++ 3.4.1 on Mandrake Linux 10.1 Reporter: Alex Nelson
> >
> >
> > I would like to validate that the id fields are unique in the list of
> > tags. I got sort of close, but could only validate using child::*.
> > I wanted to be more specific and make ids be unique.
> > It seems to me that if child::* does tells me the xml is invalid, then
> > certainly so should "child::node"
> > Here is my xml file
> > <?xml version="1.0"?>
> > <tags
> > xmlns="TStreams"
> > xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> > xsi:schemaLocation="TStreams file:///udir1/nelson/xml/ts3.xsd">
> > <tag><id>3</id></tag>
> > <tag><id>5</id></tag>
> > <tag><id>3</id></tag>
> > </tags>
> > Here is my xsd file
> > <?xml version="1.0"?>
> > <xs:schema
> > xmlns:xs="http://www.w3.org/2001/XMLSchema";
> > targetNamespace="TStreams"
> > xmlns="TStreams"
> > elementFormDefault="qualified">
> > <xs:element name="tags">
> > <xs:complexType>
> > <xs:sequence>
> > <xs:element name="tag" type="TagType" maxOccurs="unbounded" />
> > </xs:sequence>
> > </xs:complexType>
> > <xs:unique name="uniqueTag">
> > <xs:selector xpath="child::*" /> <!-- this one
> > works, but has no ref to 'id' --> <!-- <xs:selector xpath="child::node"/>
> > --> <!-- this one doesn't but should if the previous does --> <!--
> > <xs:selector xpath="descendant::id"/> --> <!-- this one gives
> > "not supported" message --> <!-- <xs:selector
> > xpath="descendant-or-self::id"/> --> <!-- this one is also "not
> > supported" --> <xs:field xpath="."/>
> > </xs:unique>
> > </xs:element>
> > <xs:complexType name="TagType">
> > <xs:all>
> > <xs:element name="id" type="xs:int" />
> > </xs:all>
> > </xs:complexType>
> > </xs:schema>
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