Working with Base Properties
I am not yet aware of how and when this will be implemented, so check for further updates of this paragraph. You can find more information about the Plone pre-defined properties in the file 'CMFPlone/skins/plone_styles/ploneCustom.css'. You may need to use your own properties in addition to the ones that are pre-defined in Plone. Instead of adding new properties to 'base_properties.props', it is probably better practice to create a new '.props' file in your skin layer and to register a stylesheet that uses it (instead of the base_properties one - see in the original 'DIYPloneStyle/skins/diystyle/renameThisFile.css.dtml' DTML code).
