DITA/docbook vs your own schema

[rebecca officer]

Does anyone know of a nice, clear list of what you save by using DITA/docbook instead of developing your own schema? 

The content maps reasonably well to DITA, but not perfectly. I'm trying to figure out whether we're better off working within the limitations of DITA, or whether we should take the DIY approach. A clear list of what you save by using DITA would be really helpful.
 
Many thanks!
Rebecca

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