add validation of SKOS files to SKOS-Editor

[NTsch]

This adds a service to the SKOS-Editor app which uses schema files to assure before publication that the SKOS-file which is being edited is valid and has all the necessary elements to be correctly displayed in the index view. This is done using the already existing data:validate function. When the user clicks on the "Publish" button in the editor, the service either returns the error message from the validation report, or publishes as usual if there are no problems.

This closes #1117.

[StephanMa]

I am currently not sure why you need the xml.xsd... and why "xml"? Isn't RDF and SKOS not XML?

[NTsch]

I am currently not sure why you need the xml.xsd... and why "xml"?

That's imported so that the xml:lang attribute which appears in the skos.xsd doesn't cause an error. There may be a better solution for this?

[StephanMa]

declare the namespace upfront should fix the error

[NTsch]

declare the namespace upfront should fix the error

I've tried both adding xmlns:xml="http://www.w3.org/XML/1998/namespace" in the root (xs:schema) and replacing <xs:attribute ref="xml:lang"/> with <xs:attribute name="lang" xmlns:xml="http://www.w3.org/XML/1998/namespace"/>, but in both cases I still get an error.

[GVogeler]

As far as I know, dchema definitions need to include all parts, i.e. if the schema imports attributes from the XML namespace the simple namespace reference is insufficient.

[StephanMa]

I See... I really really dislike this approach... but it seems to be the only way to deal with this

[StephanMa]

@NTsch Can you provide me with a short introduction how to test this?

[StephanMa]

@NTsch push

[NTsch]

@NTsch Can you provide me with a short introduction how to test this?

Make a copy of a glossary (-> /mom/index/IllUrkGlossar -> "Create personal copy"), then open it in the editor (MyArchive -> Saved Vocabularies -> Open Vocabulary in SKOS-Editor). There you can create Concepts and properties like prefLabel. If you try to publish when there's a Concept that doesn't have a prefLabel, you should get an error, otherwise it should publish normally.