Cheers,
Walter
-----Original Message-----
From: Hisham Khartabil [mailto:hisham.khartabil at telio.no]
Sent: mercoledì 16 novembre 2005 8.50
To: Goix Walter
Cc: simple at ietf.org
Subject: Re: [Simple] Questions on draft-ietf-simple-filter-format-05
On Nov 14, 2005, at 7:13 PM, Goix Walter wrote:
Hi,
I have a couple of questions regarding the handling on <exclude>
filters in an Event Server:
- when only an <exclude> filter is present (no <include>), does the
server need to provide the *whole* document but the excluded part, or
is it implicit? In other words, do the server need an <include> filter
as well to consider the whole document or part of it before to apply
the <exclude> filter?
The draft states
" The <exclude> element is used to define exceptions to the set of
XML
elements and/or attributes selected by the <include> elements."
So having an <exclude> without an <include> seems to be semantically
wrong.
- when the <exclude> filter asks for removing a mandatory element,
which is nesting elements from another namespaces, what would be the
result of the exclusion process: is it the full content of the
mandatory element, or only an 'empty' (or minimally valid) element.
Below is an example:
1. <foo> is a mandatory element within <root> with an <any> only, i.e.
it does not have any attribute nor mandate any sub-element
2. document in the server is:
<root>
<foo>
<o:bar>something</o:bar>
</foo>
</root>
3. filter contains
<exclude>
//root/foo
</exclude>
4. Result of filtering process is
(a)
<root>
<foo></foo>
</root>
or (b)
<root>
<foo>
<o:bar>something</o:bar>
</foo>
</root>
?
(b) is the choice.
From the draft
"if
the step in applying the <exclude> element value to an XML document
results in an invalid document according to the schema, that step
MUST be reveresed resulting in the elements and/or attributes being
re-introduced into the resulting XML document, with their previous
values, in order to make it valid."
Thanks,
Hisham
Thanks for the clarification
Walter
Gruppo Telecom Italia - Direzione e coordinamento di Telecom Italia
S.p.A.
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