The IRI directive should ignore empty cells

[johardi]

Having this transformation rule, for example

Class: @A*
   Annotations: foaf:depiction @B*(IRI)

will throw an error if there are empty cells in column B

[mathib]

is there a possibility to use nesting with mm:SkipIfEmptyLocation in this case? I don't know what the right notation is (and if this is even possible)...

[martinjoconnor]

I think the issue is that an error is thrown even if this directive is used.

In general, this directive can be used to seamlessly handle empty cells.

[mathib]

Well, I had a case where I could use the following successfully:

Class: @A*
   Annotations: foaf:depiction @B*(mm:SkipIfEmptyLocation)

but the result is then that the object of foaf:depiction is stored as a string (not an IRI). So we need (mm:SkipIfEmptyLocation) followed by (IRI) as the last one used on its own will throw an error if the cell is empty

But like I said, I don't know if this kind of nesting is possible... I tried several combinations without success, e.g.

Class: @A*
   Annotations: foaf:depiction @B*(IRI)@B*(mm:SkipIfEmptyLocation)

[martinjoconnor]

You can use multiple processing directives in a reference. e.g.,

Class: @A*
   Annotations: foaf:depiction @B*(IRI mm:SkipIfEmptyLocation)

[mathib]

Indeed, this is throwing the "no value present" error