[Boost-build] Property name syntax?

From: Rene Rivera (grafikrobot_at_[hidden])
Date: 2007-04-05 18:30:41

Yes, that a question... In trying to figure out why I was having 
problems using a property named "<doxygen:processor>" I ran into this:

===
# We don't add default for elements with ":" inside. This catches:
# 1. Conditional properties --- we don't want <variant>debug:<define>DEBUG
#    to be takes as specified value for <variant>
# 2. Free properties with ":" in values. We don't care, since free 
properties
#    don't have defaults.
===

Hence my question. Is there some description of what a property name 
syntax should be? Especially what kinds of chars we should not use in a 
property name?

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