Re: Does xerces2-j DOMParser enforce key constraints?

[Shengyou Zeng]

Hi Eddie,
I made the changes that you suggested, and it worked like a charm!
Thanks so much.
Now I have another question.  DOMParser merrily validates an xml
instance doc that contains an empty key value (e.g., <Name></Name
or <Name/>, while such doc crashes xsv.  The node value of the <Name>
node in the DOM tree actually is null, as expected.  It looks like that
xerces2-j DOMParser treats such value as an empty string, i.e., "".
I was expecting that an empty key value would prompt a key violation.
After all, what is the use of a key if it is empty?  But that is not the case.
So, except to enforce a key of string type to be non-empty by restricting
its minLength, is there a way that uses some aspects of XML Schema's
key constraint?
-Shengyou
At 10:03 AM 06/21/2002 +1000, Eddie Robertsson wrote:
Hi,
Thanks, Eddie.  I did what you suggested too, and retested again
after reading your message.  The parser still doesn't complain.
I had a closer look and I didn't realize that you used a targetNamespace 
for your schema. Since the selector and field elements use XPath notation 
you will have to declare a prefix for your namespace that you can use in 
the XPath expression. The reason for this is that XPath doesn't support 
default namespaces. See below.

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="http://www.bts.com/pcsp";
xmlns="http://www.bts.com/pcsp"; xmlns:xs="http://www.w3.org/2001/XMLSchema";
elementFormDefault="qualified">
You have to add a namespace declaration with a prefix for your 
targetNamespace as well. For example:

xmlns:p="http://www.bts.com/pcsp";
<xs:element name="Contact">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="Name" type="xs:string"/>
        <xs:element name="Title" type="xs:string"/>
        <xs:element name="Phone" type="xs:string"/>
        <xs:element name="Email" type="xs:string"/>
      </xs:sequence>
    </xs:complexType>
    <xs:key name="ContactKey">
        <xs:selector xpath="Contact"/>
        <xs:field xpath="Name"/>
    </xs:key>
In the xpath attribute for selector and field you must use this new 
declared prefix on your elements:

<xs:key name="ContactKey">
   <xs:selector xpath="p:Contact"/>
   <xs:field xpath="p:Name"/>
</xs:key>
Cheers,
/Eddie

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