Node vs focus node (Was: Re: shapes-ISSUE-181: SHACL conformance for partial validation reports [SHACL Spec])

Hi Karen,

On Sun, Oct 2, 2016 at 6:54 PM, Karen Coyle <> wrote:

> Dimitris, the part of the spec we are talking about is the validation
> section. If Filters take place as part of validation, then we should move
> them to the validation section. If validation takes place after the filters
> are applied, then at that point it is a focus node. My understanding (and I
> would like to hear from others) is that the entire process of validation
> takes place on focus nodes.

Section 2 describes shapes, targets, filters and constraints, then section
3 describes validation as well as the data graph, shapes graph and
validation results.
All constructs described in section 2 are referenced in the validation
definition but any feedback to restructure these sections is more than

Based on my understanding,
filters are of course part of the validation process but the term focus
node is used when the nodes reach the constraints of the shape.
As I said, I do not have a strong opinion on this and would be happy to
discuss this further during the next call or hear what others have to say

I'm also a bit concerned about that "iff" - while it is a commonly known
> shorthand for "if and only if" it is not English language and not
> universally known, so I think that "iff" should be written as "if and only
> if" when used in a sentence. If the section were in an abstract syntax then
> I think that "iff" would be appropriate. This section is not that formal. I
> do find it used in W3C documents when describing formal rules (see section
> 2.1 of the SWRL document [1]).

I replaced iff according to your suggestion.


Dimitris Kontokostas
Department of Computer Science, University of Leipzig & DBpedia Association
Research Group: AKSW/KILT

Received on Sunday, 2 October 2016 18:36:02 UTC