[xquery-talk] Question about default context node

[Michael Kay]

An initial context item is part of the dynamic context of a query as defined
in the standard. On the other hand, a product/API isn't actually required to
provide a means to set it.

In XQJ the class XQExpression (rather unexpectedly) extends
XQDynamicContext, which has a method bindContextItem(). So you can
definitely establish a context item before executing the query. 

Michael Kay
http://www.saxonica.com

> -----Original Message-----
> From: talk-bounces at xquery.com 
> [mailto:talk-bounces at xquery.com] On Behalf Of Alex
> Sent: 17 September 2004 18:27
> To: talk at xquery.com
> Subject: [xquery-talk] Question about default context node
> 
> Hi,
> 
> is a default context node part of the XQuery standard? I'm 
> getting conflicting messages. For one, I heard statements 
> that you need to use doc(), collection() or external 
> variables to pass in data to an XQuery. On the other hand, 
> implementations like Saxon provide methods like 
> setContextNode() in their Java API so a simple XPath like 
> /a/b/c is also a valid XQuery that makes sense. I like the 
> context node option because of its simplicity but am not sure 
> if it's standard. I haven't seen support for it in XQJ.
> 
> I would appreciate any clarification and references to the 
> XQuery standard concerning context nodes set from the API.  
> 
> Thanks,
> alex
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