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Re: meaning of (salary, bonus)

From: Mary Fernandez <mff@research.att.com>
Date: 07 Jan 2003 08:24:47 -0500
To: Howard Katz <howardk@fatdog.com>
Cc: www-ql@w3.org
Message-Id: <1041945887.5768.14.camel@squeak>

The context node/item can be bound in the dynamic environment
by the query environment (e.g., in an API call or via
some interface provided by the query processor).  The expression
below will raise an error if the context node is not bound, 
but will evaluate to (child::salary, child::bonus) otherwise.

On Mon, 2003-01-06 at 20:12, Howard Katz wrote: 
> I'm trying to understand the semantics of constructed sequences. The
> following query is given as an example of a valid sequence in "3.3.1:
> Constructing Sequences" in both the current XPath 2.0 and XQuery 1.0 working
> drafts:
>      (salary, bonus)
> with the following commentary: "This expression contains all salary children
> of the context node followed by all bonus children"
> Can this expression be used outside a location path? I can see returning
> this expression as a function result, but can someone provide other examples
> of valid use? And in such a case, what is the meaning of "context node"?
> Thanks,
> Howard
Mary Fernandez, Principal Technical Staff Member  
AT&T Labs - Research, 180 Park Ave., Room E243, Florham Park, NJ
phone: 973-360-8679,  fax: 973-360-8187
mff@research.att.com, http://www.research.att.com/~mff  
Received on Tuesday, 7 January 2003 08:31:03 UTC

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