Major Description
there has been some discussion recently on how to deal with internal (hidden?) content
such as for example the property reflecting the order of child nodes (see http://markmail.org/message/kzt7csiz2bd5n3ww).
while working on some initial permission code i found that currently that property name
is hardcoded in multiple places in NodeDelegate while at the same time the javadoc of
NodeDelegate#getChildren refers to a different property name.
until we reach consensus on how to deal with such internal content, if/how to hide it from
JCR API consumers and whether or not (and to which extend) that should be a implementation
detail of oak-core, i would suggest to define at least a constant on PropertyState that
allows to easily identify and adjust all usages.