if you have interacted with RDF before, you may know about something called rdf:XMLLiteral, which is a very useful and important datatype for encoding XML data directly in RDF datasets
if you have read the actual RDF 1.1 specifications, you may be surprised to learn that rdf:XMLLiteral is non‐normative, because it depends on DOM4, which is a specification which had not yet reached Recommendation status at the time of publication
can you imagine if actual programmers working on APIs flagged the parts of their programs with non‐stable dependencies the way that W3C does
if you are up on Web Standards then you probably know that DOM4, the W3C specification, no longer exists and has been replaced with the DOM Living Standard, developed by WHATWG, which makes this sort of specificity about a thousand times harder
