Relationship between standards DocBook DITA OpenDocument and CMIS, MoReq2

Question

Can anybody explain /for dummies :)/ relationship between these (mostly oasis) standards?

• DocBook, DITA, OpenDocument
• CMIS
• MoReq2

As i understand yet:

• DITA, DocBook and OpenDocument - are standards for file formats of documents
• CMIS is something what I need explain
• MoReq2 - is a standard for digital archives for storing metadata about the documents (record management standard)

So, for the portable solutions need

• store documents in the above formats (when in the what one?)
• and need describe them with MoReq2 schemas
• but where to come CMIS?

Or i'm totally wrong?

Ps: Understand than it is an complex question, but nowhere find any simply explanation of their relationship.

ps2: plus question - have any of the above support in perl?