rng-in-start-tag-name-regex

rng-in-start-tag-name-regex is a variable defined in `rng-nxml.el'.
Its value is

"<\\(?:\\(?:[_[:alpha:]][-._[:alnum:]]*\\)\\(?::\\(?:[_[:alpha:]][-._[:alnum:]]*\\)?\\)?\\)?\\="

• This variable may be risky if used as a file-local variable.

Documentation:
Not documented as a variable.