Re: Comment on ITS 2.0 specification WD - Uniquness of id value

Hi Yves,

I guess within ITS you're right. Where things break down is in the relationship with HTML id values (and possibly xml:id, whose spec I couldn't find).

Let's assume the following HTML fragment:

<body>
  <p id=p1 class=class1>text...</p>
  <p id=p2 class=class2>text...</p>
  <p id=p3 class=class1>text...</p>
</body>

and ITS rule

<its:rules xmlns:its="http://www.w3.org/2005/11/its" version="2.0">
  <its:idValueRule selector="//p[@class='class1']" idValue="its1"/>
</its:rules>

If I understand correctly, this gives me an identifier "its1" for a selection that includes the first and third paragraph in the HTML fragment while excluding the second. I could do that because I'm using class attributes in the selector. I would not have been able to do this with HTML id attributes, even if I created additional <div> nodes, because the selection is discontiguous. So there's no clear relationship between ITS id values and HTML id values.

Norbert


On Jan 19, 2013, at 5:41 , Yves Savourel wrote:

> Hi Norbert,
> 
>> 8.15 Id Value
>> - Different parts of this section seem contradictory: First, an id value 
>> is supposed to be a "unique identifier for a given part of the content", 
>> but then there's a selector that "selects the nodes to which this rule applies",
>> with "nodes" in plural. If the selector selects multiple nodes, then the
>> identifier isn't unique.
> 
> I'm not sure I understand the issue.
> 
> The selector attribute selects the nodes to which the idValue attribute applies.
> 
> The value of idValue is not the ID but an XPath expression to construct the ID. That ID can be the value of a local attribute for example, or a construction of a unique value as shown in example 72[1].
> 
> cheers,
> -yves
> 
> [1] http://www.w3.org/TR/2012/WD-its20-20121206/examples/xml/EX-idvalue-element-2.xml
> 
> 
> 
> 
>

Received on Monday, 21 January 2013 08:06:39 UTC