On 21/09/2022 08:00, Lorenz Buehmann wrote:
Interesting question. I think currently the Fuseki SHACL service expects
a Turtle file for the shapes acording to [1]. I agree that this seems to
be rather inefficient.
@Sebastian - how much data is there? (in triples ideally)
What does 300mb translate into in terms of numbers of triples and shapes?
How long (lcoally from a file) does it take to parse the shapes?
@Andy:
- the code expects only Turtle format, right? RDF/XML would fail to
parse the shapes then, correct?
No. The Content-Type header is used - if that fails, the default lang
provided is used.
- the shapes are parsed into a Graph, wouldn't it be possible to reuse a
named graph of the backend dataset containing the shapes?
Possible to implement, yes.
Do you mean the same dataset as the data? (that is, using the dataset as
a collection of graphs). Or a different dataset for storing shapes
separately from the data (maybe default union graph is being used on the
data).
Both are possible, the first is easier. The second gets into naming
named graphs in other datasets.
"http://example/dataset#encoded-named-graph-uri"; could be be used (does
not work ATM - it needs implementing.)
> Or would it be
> too slow to use shaped from e.g. a TDB backend?
Jena SHACL parses the shapes and then executes from an in-memory
datastructure (a bit more than the AST but not much) so execution is not
dipping in and out of the database. It should be fast enough.
The parsing is cacheable. Cache invalidation is hard if it's a
different dataset.
This would be a good example of adding more capabilities by using a
Fuseki Module:
https://jena.apache.org/documentation/fuseki2/fuseki-modules
The idea is to make the fuseki-server jar
(1) Fuseki main
(2) A set of modules (for now, admin, UI; later - open ended set)
and the user can choose the server functionality by the selection of
modules.
Andy
Cheers,
Lorenz
[1]
https://github.com/apache/jena/blob/main/jena-fuseki2/jena-fuseki-core/src/main/java/org/apache/jena/fuseki/servlets/SHACL_Validation.java#L66
On 20.09.22 17:22, Sebastian Faubel wrote:
Hello everyone,
I am using Jena Fuseki 4.6.1 with a dataset that I want to validate using
SHACL. I've seen the documentation on the SHACL feature in Apache Jena
Fuseki here:
https://jena.apache.org/documentation/shacl/
My issue is that my SHACL shapes graph has around 300mb. Uploading this
every time I want to validate would be pretty slow and inefficient. I was
wondering if it is possible to persist the shapes graph in the dataset
somehow?
Thank you! :)
~Sebastian
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