[Zope] bobobase_modification_time and .zexp

[Marcin Kasperski]

Wolfgang Strobl wrote:
> 
> import/export obviously doesn't preserve time stamps (i.e.
> bobobase_modification_time). This is unfortunate for any content
> which depends on those timestamps. How do you people out there
> solve this problem when it comes to moving content from different
> Zope installations into a single one?
> 

I just developed custom document ZClass which basically:
- inherits from CatalogAware and DTML Document
- contains custom property sheet which contains creationTime attribute
(and some others, like meta_keywords or meta_summary)
- constains constructor method which sets creationTime to current time.

Wherever I need information when the page has been created, I use my
creationTime attribute.

I do not know how to implement 'modificationTime' attribute (or better:
how to change it whenever someone edits or uploads the document).

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