Re: ShEx relation to SPIN/OWL

* John Snelson <> [2014-07-03 10:31+0000]
> Hi John,
> On 03/07/14 08:18, john.walker wrote:
> > I know many people who would consider SPARQL to be a declarative
> > language, albeit not with the specific purpose of validation.
> SPARQL is a declarative language for querying RDF. ShEx is a declarative 
> language for describing RDF shapes. With declarative languages it's 
> vital to talk about the context in which it is declarative.
> > Even with a declarative validation language I would expect, in many
> > real-world use cases, there is more than one way to skin a cat.
> > I'm not sure I understand your last point about an RDF based syntax, do
> > you mean RDF/XML specifically here?
> I certainly don't mind there being an RDF representation of ShEx, but 
> there also needs to be a syntax that is easily written and read.

Just as an FYI, there's a View as <Resource Shapes> link in the ShEx
Demo so you can get some idea what it would look like in RDF.

> > Personally I think it is pretty cool to have an RDF representation of
> > ShEx that could be serialized to any of the concrete RDF syntaxes.
> > Primarily for these reasons:
> > - ShEx could be stored in a graph store
> > - ShEx could be used to validate itself
> > - ShEx could be queried or constructed using SPARQL
> Agreed, although syntax is not the only factor here. XML Schema has an 
> XML based syntax, but going from the XML syntax to a usable 
> representation of the model is so complicated that it's not generally 
> considered feasible in XSLT/XQuery.

Because RNG has a start token, I was able to do something like this with RNC:
, but I used perl and DOM and that sort of stuff (to compile XSLT).
I agree, coercing something into your representation model is only the first,
and probably the easiest, step

> John


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Received on Thursday, 3 July 2014 13:42:03 UTC