Hi Alessandro,
this is a change we have in mind already for a long time, but we need to
be careful about the implications because it transforms LDPath into a
tree matching language with all consequences (essentially this is then a
unification problem with variable binding). Actually my PhD 10 years ago
was exactly on that issue (we called it "simulation unification" then,
referring to the two algorithms we used as a foundation - graph
simulation and term unification)... ;-)
I'll still think about it a bit, but I think there is a clear
opportunity for a good improvement here.
Greetings,
Sebastian
Am Dienstag, den 19.11.2013, 09:39 +0000 schrieb Alessandro Benedetti:
> Hi guys,
> following a discussion related to Apache Stanbol, I want to propose a new
> feature in LDPath query language, to obtain nested queries and nested
> objects extracting properties from a specific resource.
>
> An example of syntax can be :
>
> city= ../foaf:based_near { name=gn:name, population=gn:population, state=
> gn:state }
>
> Accessing to a RDF resource and then, for each resource satisfying the
> parent expression, retrieve an object.
> The Object properties should be the ones listed in the provided map, with
> the specific aliases.
>
> In the previous example , for example having these three resources that
> satisfy the first expression ( city= ../foaf:based_near ) , we want to
> retrieve these 3 objects of type city ( the population numbers are fancy
> number):
>
> city1{ name= Paris, population= 13.000.000, state=France}
> city2{ name= Rome, population= 6.000.000, state=Italy}
> city3{ name= London, population= 16.000.000, state=England}
>
> The scope of this improvement is to provide the possibility of extract
> array of objects with custom properties from the resources of our data set.
>
> --
> --------------------------
>
> Benedetti Alessandro
> Visiting card : http://about.me/alessandro_benedetti
>
> "Tyger, tyger burning bright
> In the forests of the night,
> What immortal hand or eye
> Could frame thy fearful symmetry?"
>
> William Blake - Songs of Experience -1794 England
>
>
>
