Comment by tannhaeuser

> Do you have any pointers on how to find these in the spec or in the handbook?

I just checked now, and apart from FSIDR I was mainly referring to DAFE [1], a HyTime 2nd ed. facility actually part of AFDR (archforms) allowing additional attribute capture and mappings in link rules towards a more complete transformation language as SGML's link rules are a little basic when it comes to attribute handling. Note in a HyTime context, transformations (for lack of a better word) are specified by AFDR notations/data attributes in not only a highly idiosyncratic way but also redundantly when SGML LINK is perfectly capable to express those classes of transformations, and more. sgmljs only implements LPD-based transformations (yet with more power such as inheritance of DTDs into type checking of template processing contexts and pipelining) and only the DAFE part of AFDR but not other parts.

[1]: http://mailman.ic.ac.uk/pipermail/xml-dev/1998-July/004834.h... (see also ISO/IEC 10744 - A 5.3 Data Attributes for Elements (DAFE))