Re: Question about XPath expressions

Hi Arjan,

The change log in I.2 is pretty informal in the way it discusses this
change. Take a look at 3.2 to see the actual change. Look for the text
starting with "Each operation E1/E2 is evaluated as follows:". The
change is that it is no longer an error if E2 evaluates to a sequence of
atomic values. We provide specifically for that case:

> If every evaluation of E2 returns a (possibly empty) sequence of
> atomic values, these sequences are concatenated, in order, and
> returned.

Although the change log is informal, I think this reference is precise 
and clear. Do you agree?

Jonathan

Arjan Huijzer wrote:
> Hello,
> 
> I have a question about the usage of XPath expressions.
> 
> In the latest XQuery specifications it says that the last step of a 
> XPath expression can now return a sequence of nodes (I.2 29 Oct
> 2004). Looking at the grammar rules (A.1 EBNF), it seems that
> PathExpr (rule 61) is a special form of an OrExpr (43), which can
> only return a "true" or "false" value.
> 
> Are the specifications not clear on this point or am I missing
> something?
> 
> Thanks in advance for any help!
> 
> Arjan Huijzer The Netherlands
>

Received on Monday, 8 November 2004 12:21:59 UTC