Are PI's documented?

[CxRes]

Are the available PI's documented somewhere? Alternatively, can you point me where in the code I can look at them?

[cabo]

kramdown-rfc just hands through PIs, except for <?line ±nnn?> ones. (The code for this is at https://github.com/cabo/kramdown-rfc/blob/master/lib/kramdown-rfc2629.rb#L964 .) I don't think the way xml2frc then reacts on those PIs is documented (current RFCXMLv3 ideology is that we shouldn't be using PIs at all, but then we do); you may want to ask the same at https://github.com/ietf-tools/xml2rfc/issues

[CxRes]

Issue filed: https://github.com/ietf-tools/xml2rfc/issues/1035