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Subject: Re: [xdi] Groups - On the extension of $word set in XDI (Draft-Contrib-OASIS-XDI-dollar-words-v03.pdf) uploaded
Hello Markus!Actually I've thought at this possibility; which is really useful; this pave the way to n-variables query like the following:
At 23.55 15/03/2008, Markus Sabadello wrote:
What would you think about adding a number to that variable, so you can use that feature more than once in a query? For example $any$1, $any$2, etc.
=markus
$get
/
$any$1
$is$a
@uniroma2+professor
$any$1
+age
$any$2
$any$2
$greater
"60"
get all uniroma2's professors older than 60 yo; tell me how old are them.
Unfortunately the inconvenience I see is that this way the matching pattern rule is broken, i.e. there is ambiguity related to whether "$1" is a pattern to match or an identifier for a variable: The following statements
=markus
$get
/
=giovanni
$any$1
"giovanni.bartolomeo@unroma2.it"
may mean "unify $any with the first subsegment of the predicate whose second segment is $1 and whose object is giovanni.bartolomeo@uniroma2.it", that's my first email.
I'm trying to work out a solution for this since 5 days.. but it didn't has arrived yet!
Suggestions very welcome!!! :-)
Giovanni
One advantage of this would be that the brackets wouldn't be necessary (thus keeping the syntax simple), since there would be implicit AND relationships between statements that use the same variable, and implicit OR relationships between those that don't.
Let me try to give an example to show what I mean:
=markus
$get
/
=giovanni
+friend
$any$1
$any$1+age
$lesser
"40"
=giovanni
+brother
$any$2
$any$2+age
$greater
"25"
This asks for all of Giovanni's friends younger than 40, and for all of Giovanni's brothers older than 25:
=giovanni/+friend/=Piergiorgio
=piergiorgio+age/$type$xsd$number/"25"
=giovanni/+friend/=mcoil
=mcoil+age/$type$xsd$number/"28"
=giovanni/+brother/=marco
=marco+age/$type$xsd$number/"30"
What do you think?
Markus
On 13 Mar 2008 10:59:13 -0000, < giovanni.bartolomeo@uniroma2.it> wrote:
- New $words added: $and, $or, $any, $all; replaced weak order
- relationship operators with composition of atomic $word operator ($equal,
- $lesser,
- $greater, $or); replaced $equals with $equal. Assumed that both subject and
- object
- in a XDI statement can be XDI documents.
- -- Giovanni Bartolomeo
- The document revision named On the extension of $word set in XDI
- (Draft-Contrib-OASIS-XDI-dollar-words-v03.pdf) has been submitted by
- Giovanni Bartolomeo to the OASIS XRI Data Interchange (XDI) TC document
- repository. This document is revision #2 of
- Draft-Contrib-OASIS-XDI-dollar-words.pdf.
- Document Description:
- This document propose the extension of $word set in order to introduce
- concepts like equivalence, order and numbers in XDI; as well as Boolean
- operators and query keywords
- View Document Details:
- http://www.oasis-open.org/apps/org/workgroup/xdi/document.php?document_id=27547
- Download Document:
- http://www.oasis-open.org/apps/org/workgroup/xdi/download.php/27547/Draft-Contrib-OASIS-XDI-dollar-words-v03.pdf
- Revision:
- This document is revision #2 of Draft-Contrib-OASIS-XDI-dollar-words.pdf.
- The document details page referenced above will show the complete revision
- history.
- PLEASE NOTE: If the above links do not work for you, your email application
- may be breaking the link into two pieces. You may be able to copy and paste
- the entire link address into the address field of your web browser.
- -OASIS Open Administration
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