mmark output not accepted by xml2rfc

[ktmf01]

The following input renders fine

%%%
title = "Test"

[seriesInfo]
name = "Internet-Draft"
stream = "IETF"
status = "standard"
value = "0"

[[author]]
fullname="Martijn van Beurden"

%%%

.# Abstract

Test

{mainmatter}

# bit Rice parameter

More test

But if I change the section title to # 5 bit Rice parameter I get

test.xml(20): Error: Invalid attribute anchor for element section, at /rfc/middle/section
/home/pi/bin/flac-specification/test.xml(3): Error: Invalid document before running preptool.
Unable to complete processing test.xml

Don't know whether this is deliberate or not, it seems xml2rfc doesn't like anchors starting with a digit?

[miekg]

[ Quoting @.***> in "[mmarkdown/mmark] mmark output not ..." ]

test.xml(20): Error: Invalid attribute anchor for element section, at /rfc/middle/section /home/pi/bin/flac-specification/test.xml(3): Error: Invalid document before running preptool. Unable to complete processing test.xml

Don't know whether this is deliberate or not, it seems xml2rfc doesn't like anchors starting with a digit?

Haven't checked, but could very well be the case. You probable want a header-id to set the reference for the header

# 5 Bit Stuff {#my5bitid}

[ktmf01]

Thanks!