Re: [proto-wd] determining the base IRI

Lee Feigenbaum wrote on 02/08/2007 04:06:08 PM:

> 
> Hi everyone,
> 
> Re: ACTION: Lee to adapt text from 4.1.1 to specify how the protocol can 

> contribute to the base IRI for query evaluation as per #relIRIs in the 
QL 
> spec
> 
> At the end of this week's teleconference, Eric and I discussed whether 
the 
> protocol specification should discuss how it contributes to 
determination 
> of the base IRI used for resolving relative IRIs when parsing/executing 
a 
> SPARQL query.
> 
> Currently, rq25 already contains this text in 4.1.1 Syntax for IRIs > 
> Relative IRIs:
> 
> """
> The BASE keyword defines the Base IRI used to resolve relative IRIs per 
> RFC3986 section 5.1.1, "Base URI Embedded in Content". Section 5.1.2, 
> "Base URI from the Encapsulating Entity" defines how the Base IRI may 
come 
> from an encapsulating document, such as a SOAP envelope with an xml:base 

> directive, or a mime multipart document with a Content-Location header. 
> The "Retrieval URI" identified in 5.1.3, Base "URI from the Retrieval 
> URI", is the URL from which a particular SPARQL query was retrieved. If 
> none of the above specifies the Base URI, the default Base URI (section 
> 5.1.4, "Default Base URI") is used.
> """
> 
> (Aside: Eric, can you add in the anchor point here that we discussed? 
> #relIRIs)
> 
> I took a stab at editing the protocol document (not yet checked into 
CVS) 
> and came up with something almost identical but a bit different:
> 
> """
> Determining the Base IRI
> 
> Relative IRIs that appear in a [SPARQL] query are resolved against a 
base 
> IRI as per [RFC3986] section 5.1, "Establishing a Base URI". If present 
in 
> the query, the BASE keyword defines the Base IRI used to resolve 
relative 
> IRIs per RFC3986 section 5.1.1, "Base URI Embedded in Content". 
Otherwise, 
> Section 5.1.2, "Base URI from the Encapsulating Entity", defines how the 

> Base IRI may come from an encapsulating document, such as a SOAP 
envelope 
> with an xml:base directive. (See 2.3 SOAP Envelope. Otherwise, the 
> "Retrieval URI" identified in 5.1.3, Base "URI from the Retrieval URI", 
is 
> the URL of the SPARQL protocol service implementing the SparqlQuery 
> interface. If none of the above specifies the Base URI, the default Base 

> URI (section 5.1.4, "Default Base URI") is used.
> """

Following the discussion with Andy, I'll suggest replacing the sentence 
which begins "Otherwise, the "Retrieval URI"..." with:

"""
Otherwise, the 
"Retrieval URI" identified in 5.1.3, Base "URI from the Retrieval URI", is 

the complete URL used to send a particular SPARQL query to a SPARQL 
protocol service implementing the SparqlQuery 
interface.
"""

If we agree on this (or related) text, I think that the query language 
specification should also be updated accordingly. Eric?

Lee

> In particular, note the difference in how to intepret 5.1.3 of RFC3986 - 

> the query spec. talks about the "retrieval URI" as "the URL from which a 

> particular SPARQL query was retrieved" whereas (following the discussion 

> with EricP) whereas the text I came up with for the protocol spec says 
> that the "retrieval URI" corresponds to the URL of the SPARQL service 
> endpoint. I'm not sure which is more correct (if either), but I am 
pretty 
> sure that the two documents should agree on their recommendation for 
> interpreting RFC3986 5.1.3.
> 
> thoughts?
> 
> Lee
> 
>

Received on Sunday, 11 February 2007 19:14:58 UTC