Text class quest (is_environment)

[Jose' Matos]

This question is probably directed to Jean-Marc, but if anyone knows...

In lyxlayout.h we have:

...
        bool is_environment;
...
        bool isEnvironment() const;

  I understand the meaning of the second, it is clear by the function 
definition.

  But the first is amazing, I have no idea where this comes from.
grep -n -e is_environment *.[Ch] /dev/null
lyxlayout.C:119:                is_environment = false;
lyxlayout.h:143:                bool is_environment;
lyxtextclass.C:234:     lay.is_environment = true;
paragraph_funcs.C:765:  if (layout->is_environment) {
text2.C:367:            if (lyxlayout->is_environment) {

  Any clue?
-- 
Jos� Ab�lio

LyX and docbook, a perfect match. :-)