[Mulgara-general] Mulgara xsd:date

[12470 at ufp.pt]

Hi,

This is my second post on the same topic, but I really don't know what  
is the problem on working in dates on mulgara.

First, I really appreciate other doc resources because the actual  
don't give me enough knowledge to do queries with dates or other  
datatype.

I read all the docs and I have done the follow.

My rdf file is like this :

<rdf:RDF
     xmlns:sakai="http://elearning.ufp.pt/events/opc2#"
     xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
     xmlns:xsd="http://www.w3.org/2001/XMLSchema#" >
   <rdf:Description rdf:nodeID="A0">
     <sakai:date  
rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2005-12-30  
17:45:07.0</sakai:date>
     <rdf:type rdf:resource="http://elearning.ufp.pt/events/opc2#SAKAI_EVENT"/>
     <sakai:event>pres.end</sakai:event>
     <sakai:event_code>m</sakai:event_code>
     <sakai:session_id>023e6ea7-f3ea-4feb-008d-aa7feb91e49f</sakai:session_id>
      
<sakai:ref>/presence/470f36f8-19e6-44ed-00d5-b031baee54bd-presence</sakai:ref>
   </rdf:Description>

I load this file into mulgara and then use the following alias on iTQL  
console:

set time on ;
alias <http://mulgara.org/mulgara#> as mulgara;
alias <http://elearning.ufp.pt/events/opc2#> as sakai;
alias <http://www.w3.org/1999/02/22-rdf-syntax-ns#> as rdf;
alias <http://www.w3.org/2000/01/rdf-schema#> as rdfs;
alias <http://www.w3.org/2001/XMLSchema#> as xsd;

then created the xsd model like this:

create <rmi://localhost/server1#xsd>  
<http://mulgara.org/mulgara#XMLSchemaModel>;


And try to do a simple query :

select $doc from <rmi://localhost/server1#sakai_events>
where $doc <sakai:event_date> $date
and $date <mulgara:before> '2000-01-01' in <rmi://localhost/server1#xsd>
and $date <mulgara:after> '1899-12-31' in <rmi://localhost/server1#xsd>;

But it always return no results.

I know that xsd:date is not equal to the dates I used. But I really  
don't know how to solve my doubt.

If anyone could give me a link, doc, explanation even a simple one I  
will really appreciate.

Thanks

Victor Magalhães


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