Cairo release schedule and strategy

I am trying to determine the stable release strategy for cairo and cairomm.

 From the web site, current versions are cairo 1.14.12 and (apparently) 
cairomm-1.15.5.

However there also seems to be a cairo-1.15.12.

It appears that the strategy is for development versions to use odd 
minor versions and stable versions to use even minor versions.  Is this 
correct?  If so there seems to be a contradiction between cairo and cairomm.

It would also be useful to know if there is a schedule for stable 
releases.  If so, can you share it on the web site (or point me to where 
it is)?

Thank you.

   -- Bruce Dubbs
      linuxfromscratch.org
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