lpath question

lpath question

[Hans van der Meer]

In xml processing I have the following element:
<abc>
   <xyz>contents</xyz>
   <xyz>contents</xyz>
</abc>

In the code it seems to make no diffence if I write /xyz or xyz  
without the / for the xyz-node.
{\xmlindex{#1}{/xyz}{1}}
{\xmlindex{#1}{xyz}{2}}

In the reference manual I find the / used, as for example in  
{\xmlfirst{#1}{/caption}}.
My question therefore: what exactly causes this behaviour? is it good  
coding practice to always use /xyz in this case?

Hans van der Meer




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Re: lpath question

[Hans Hagen]

On 11-3-2010 22:35, Hans van der Meer wrote:
> In xml processing I have the following element:
> <abc>
> <xyz>contents</xyz>
> <xyz>contents</xyz>
> </abc>
>
> In the code it seems to make no diffence if I write /xyz or xyz without
> the / for the xyz-node.
> {\xmlindex{#1}{/xyz}{1}}
> {\xmlindex{#1}{xyz}{2}}
>
> In the reference manual I find the / used, as for example in
> {\xmlfirst{#1}{/caption}}.
> My question therefore: what exactly causes this behaviour? is it good
> coding practice to always use /xyz in this case?


/ anchors in the #1 node

<a>
   <b>
     <c>c</c>
   </b>
   <b>
     <c>c</c>
   </b>
   <c>c</c>
</a>

so, if #1 == a then /c is more restictive than c

also, if you know that you only need the direct child node, it's faster 
as there is no need to go deeper

Hans


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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________