Re: Semantic Web Steps / Use Cases

Alex,

Is this a use case for NON-xml content flowing between steps ?

Mohamed

On Tue, Mar 5, 2013 at 7:44 PM, Alex Milowski <alex@milowski.com> wrote:
> The basic use cases are:
>
> 1. Harvest information via RDFa from a collection of documents.
>
> 2. Translate between RDF and Turtle.
>
> 3. Query RDF/Turtle locally via SPARQL.
>
> 4. Access SPARQL endpoints and process the results.
>
> This step harvests information from a collection documents via RDFa 1.1 [1].
> The input is any kind of markup that utilizes RDFa and the output is either
> RDF or Turtle [2].
>
> The step's declaration:
>
> <p:declare-step type="p:harvest-rdfa">
>    <p:input port="source" sequence="true" primary="true"/>
>    <p:input port="initial-context"/>
>    <p:output port="result" primary="true"/>
>    <p:option name="output-type" select="'application/rdf+xml'"/>
>    <p:option name="profile"/>
> </p:declare-step>
>
> Note: I'm not overly attached to the name.
>
> The input is a sequence of documents from which an annotation graph is to be
> harvested.  The result is the union of the graphs.
>
> The 'output-type' controls the output vocabulary and can either be RDF
> (application/rdf+xml) or Turtle (text/turtle), specified by media type.  If
> the output is Turtle, a c:data element will wrap the tuples in Turtle
> syntax.
>
> The 'profile' option can either be the strings 'xml', 'xhtml', or 'html' for
> the various defined RDFa profiles.  Other values are implementation defined.
>
>
> Also, we need steps that go between RDF and Turtle:
>
> <p:declare-step type="p:turtle2rdf">
>    <p:input port="source" primary="true"/>
>    <p:output port="result" primary="true"/>
> </p:declare-step>
>
> <p:declare-step type="p:rdf2turtle">
>    <p:input port="source" primary="true"/>
>    <p:output port="result" primary="true"/>
> </p:declare-step>
>
> I could also imagine a local SPARQL [3] query step:
>
> <p:declare-step type="p:sparql-query">
>    <p:input port="source" sequence="true" primary="true"/>
>    <p:input port="query"/>
>    <p:output port="result" primary="true"/>
>    <p:option name="output-type" select="'application/rdf+xml'"/>
> </p:declare-step>
>
> I'm not sure what other options people might want on a SPARQL query.
>
> SPARQL end points are often accessed over HTTP and so we already have that
> covered.  The results are often in Turtle, RDF, or possibly now RDFa.  The
> above steps should help process that information.
>
> [1] http://www.w3.org/TR/rdfa-core/
> [2] http://www.w3.org/TR/turtle/
> [3] http://www.w3.org/TR/rdf-sparql-query/
>
> --
> --Alex Milowski
> "The excellence of grammar as a guide is proportional to the paucity of the
> inflexions, i.e. to the degree of analysis effected by the language
> considered."
>
> Bertrand Russell in a footnote of Principles of Mathematics



-- 
Innovimax SARL
Consulting, Training & XML Development
9, impasse des Orteaux
75020 Paris
Tel : +33 9 52 475787
Fax : +33 1 4356 1746
http://www.innovimax.fr
RCS Paris 488.018.631
SARL au capital de 10.000 €

Received on Monday, 22 April 2013 12:15:42 UTC