With reference to this email:
https://sourceforge.net/account/registration/recover.php?hash=f90e3bb1e31d1190f44817b9e63599c8
The initial set of changes are detailed below:
1. Renaming of the top level term in SBO, from 'sbo term' (SBO:0000000) to 'systems biology representation'.
2. Renaming of the term 'entity' (SBO:0000236) to 'physical entity representation'.
3. Restructuring the top terms in the 'quantitative parameter' (SBO:0000002) branch to introduce a new top level term 'systems description parameter',
and a 'qualitative parameter' child term .
4. Renaming of 'interaction' (SBO:0000231) to 'occurring entity representation'.
These will have repercussions on downstream terms.
link correction : http://sbml.org/Forums/index.php?t=tree&goto=6728&rid=0