labeled images in cardsort problems

[David Austin]

As part of the Proteus project, the ULA team authored two #cardsort problems with #prefigure diagrams included in a #response.  Generated images, like #prefigure, #latex-image, and so forth, require a @label attribute, which becomes the filename of the image.  Including a generated image in a cardsort response or premise, however, generates a duplicate-label error in spite of the author including a unique label.  This seems likely to be an issue in other problem types, such as Parsons problems.  Following some discussion in https://github.com/PreTeXtBook/pretext/issues/2927, I'm writing here to start a broader discussion.

Two points from that discussion:

-- The duplicated elements are formed in the assembly process, which includes the labeled images twice.  This triggers the error though the resulting behavior is what we want:  the image is created once with two references to it.  So a reasonable solution is to simply move the check on duplicate labels earlier in the assembly process.

-- One copy of the #image is included inside a #tabular, which violates the schema.  If we want to support this feature, we need another element to support the layout in static builds, perhaps an sbsgroup.

David

[Rob Beezer]

Thanks, David, for moving the discussion here. Bigger than just the original
symptom.

On 7/27/26 04:49, David Austin wrote:
> -- The duplicated elements are formed in the assembly process, which includes
> the labeled images twice.  This triggers the error though the resulting behavior
> is what we want:  the image is created once with two references to it.  So a
> reasonable solution is to simply move the check on duplicate labels earlier in
> the assembly process.

I have this on a branch from yesterday that still needs more work - I was going
to go after some stuff in -assembly anyway, so this is just part of that bigger
package.

Rob

[Rob Beezer]

On 7/27/26 04:49, David Austin wrote:

> -- The duplicated elements are formed in the assembly process, which includes
> the labeled images twice.  This triggers the error though the resulting behavior
> is what we want:  the image is created once with two references to it.  So a
> reasonable solution is to simply move the check on duplicate labels earlier in
> the assembly process.

The duplicate check has been resolved by moving the check earlier in the
assembly process, so it only reflects *authored* source material.

https://github.com/PreTeXtBook/pretext/pull/3080

[David Austin]

Thanks for your work on this, Rob.

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