[Zope-CMF] Metadata API suggestion

[Jens Quade]

Hi,

changing the set of Metadata for CMFdefault content types 
brought up the following problem:

 The _edit method of CMFDocument gets all Metadata headers
 using self.getMetadataHeaders(), but writes only an arbitrary
 subset of them back using self.editMetadata(). Both methods
 inherited from DublinCore.DefaultDublinCoreImpl.

 I think it would be nice to have another update function for
 Metadata, e.g. "setMetadata" that works so that
 
    obj.setMetadata(obj.getMetadataHeaders())

 changes nothing except Last modification date, and for example

    header=obj.getMetadataHeaders()

    header['Title']='foo'

    obj.setMetadataHeaders(header)

 changes only the Title. 

 The current implementation strips all Metadata not known to
 Document which makes it difficult to add new metadata columns.


regards,
jens

CC to tracker.