I think whether RELS-EXT (or any other "special" datastream) is inline
or managed shouldnt matter to Fedora.  But the current expectation is
that its all inline.  Given the memory requirements that this
currently imposes, it seems like it should be formally relaxed in
future versions of Fedora.  Any objections?  If not i'll create an
issue for this.

- Chris

On Monday, May 18, 2009, Aaron Birkland <[email protected]> wrote:
> I was digging through some older e-mail when I found this.  I don't
> think anybody responded:
>
>> we created a Fedora object via Fedora-Admin tool with a RELS-EXT data
>> stream which has a control group “Managed Content”.
>
> <snip>and everything worked fine, but the documentation says
> otherwise:</snip>
>
>> “The RELS-EXT Datastream should be encoded as an Inline XML
>> Datastream, meaning that the relationships metadata is expressed
>> directly as XML within the digital object XML file (as opposed the
>> relationship metadata existing in a separate XML file that the digital
>> object points to by reference).”
>
> I don't know of any specialized code in Fedora itself that assumes
> RELS-EXT is an inline datastream, so I am not surprised that everything
> works.  However, there's has been precedent for some external utilities
> (such as migration tools) to assume that RELS-EXT is inline.  The 2.2 ->
> 3.0 migration tool was one.  It simply applied an XSL transform to every
> foxml file, and assumed that RELS-EXT was either inline, or did not
> exist in the object.  A managed RELS-EXT datastream would likely have
> caused a problem to the utility or to the resulting data.
>
> I believe that the specific control group for RELS-EXT (or any
> datastream) should ideally be irrelevant as far as the repository and
> utilities are concerned.  Unfortunately, I don't know what other tools
> or services do/will operate under the inline XML assumption, so I would
> proceed with caution.
>
>   -Aaron
>
>
>
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