SFM specification clarification in USFM

[mhosken]

I may have missed this in documentation, but I think it worth capturing. The general understanding is that an SFM marker runs from a \ to the next space character. But in real world usage within USFM3, this isn't strictly correct. There are a number of delimiters to an SFM marker:

• whitespace Obviously this is a delimiter, which is why care must be taken when parsing milestones. A milestone isn't a single marker. It is a marker that has content that is delimited by \*.
• * Whitespace following the end of a closing marker is considered significant. No marker may contain a * except at the end. Therefore * is a delimiter for a marker and is unique in being part of the marker.
• \ The start of another marker delimits the previous marker

Have I missed any?

(BTW I would be happy to help in a USFM specification working group)