Re: [xsl] XSLT Streaming: What is the rationale for the rule that a chil


On 27 Oct 2013, at 09:30, Costello, Roger L. <costello(_at_)mitre(_dot_)org> 
wrote:

Hi Folks,

XSLT streaming has this rule:

      XSLT code cannot process a child 
      element more than once.

I seek to understand the rationale for this rule.

I think the rationale is this:

Imagine a child element that contains a lot of stuff and has a very deep 
subtree. The first time the child is referenced, the XSLT processor moves 
forward in the XML, through the deep subtree. If the child is allowed to be 
referenced again, the XSLT processor would need to "back up" in the XML, 
potentially a long ways. In streaming we want to keep moving forward, without 
any backing up.

Is that correct?


Yes.

Michael Kay
Saxonica
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Re: [xsl] XSLT Streaming: What is the rationale for the rule that a child can be processed only once?