W3C home > Mailing lists > Public > public-semweb-lifesci@w3.org > June 2007

Re: Using Labels in SPARQL

From: Bijan Parsia <bparsia@cs.man.ac.uk>
Date: Fri, 1 Jun 2007 12:51:55 +0100
Message-Id: <91C8FEB3-55C1-4B1A-90B2-CD21750F78B1@cs.man.ac.uk>
Cc: public-semweb-lifesci hcls <public-semweb-lifesci@w3.org>
To: Dan Brickley <danbri@danbri.org>

On 1 Jun 2007, at 12:36, Dan Brickley wrote:

[snip]
> Perhaps I misunderstand the issue,

At least a nuance.

> but I wonder whether a block of additional PREFIX declarations  
> would be enough in some cases.

Yes. It can help with giving a readable name (though then you have  
two places to synch your query and if you have a lot of names you can  
blow up the prefix heading).

> Eg. testing in http://xmlarmyknife.org/api/rdf/sparql/query (ARQ- 
> based),
> I can write the usual:
>
> 	PREFIX foaf: <http://xmlns.com/foaf/0.1/>
> 	SELECT * WHERE {?x a foaf:Document }
> 		
> ...or I can use PREFIX to create direct abbreviations for classes  
> and properties, in this case abbreviating the verbose and  
> forgettable word "Document" to the more user-friendly "Doc":
>
> 	PREFIX foaf: <http://xmlns.com/foaf/0.1/>
> 	PREFIX Doc: <http://xmlns.com/foaf/0.1/Document>
> 	SELECT * WHERE {?x a Doc: }
>
> This would only be useful where a limited number of such  
> declarations were needed. And they'd still clutter the query, but  
> would at least be isolated to a set of skimmable declarations at  
> the top of the query, rather than in the intellectually more  
> demanding WHERE clause.

And they don't address the issue of having to label probe. I.e.,  
prefix tricks help with the readability of individual triples, but  
don't simplify the query overall.

Plus, consider the use in output, and, esp. if you are using the  
results from one query to create or adjust others (say in the  
Virtuoso client or one of the web forms).

Cheers,
Bijan.
Received on Friday, 1 June 2007 11:51:18 GMT

This archive was generated by hypermail 2.3.1 : Tuesday, 26 March 2013 18:00:48 GMT