In FHIR-38642 .NET validation has issues with narrative of Questionnaire instances - Jira (hl7.org) we discovered that when a Questionnaire.item.linkId has a space in it, it will lead the IG Publisher to create a narrative which fails XHTML validation due to a space in the id for a table cell.

Resource.id is of type id (at least in R5 again, in R4/B it's still a string with no constraints), which has a constraint preventing any spaces in it.

Questionnaire.item.linkId however is, also in R5, still a plain string.

• Do we want to prevent linkId to have spaces, either by making it of type id or by providing another constraint on it?
• Or is it OK to have a space in linkId an should we have the IG Publisher transform that to create a valid table cell id?