Neither of those attributes reveal information about the
implementation of the objects in question. They both reveal
information about the state that some client could find useful. They
are both values that, if not directly available from the object should
be calculated by the object, as calculating the value requires
knowledge about the implementation.
This approach still isn't 'good' OO -- it might not leak
implementation details, but it supports asking, not telling.
http://pragprog.com/articles/tell-dont-ask
"That is, you should endeavor to tell objects what you want them to
do; do not ask them questions about their state, make a decision, and
then tell them what to do."
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