A proposal regarding Media Use terms

[Rosie Le Faive]

Hi all,

Since the start of Islandora 2, we've been using the PCDM Use extension to "tag" our media entities with terms like "Original file" and "Service file" to determine how they get used.

The "expected behaviours" thus far are:

* "Original file" should generally be applied to the main uploaded file, and it will be the source of derivatives.

* "Service file" is a derivative generated from Original file at a lower quality.

* Depending on the model/type, either the Original File or the Service File will be displayed to the user in a viewer. 

I'd like to propose the following:

* "Original file" still gets applied to main uploaded files, and is in general the source file for derivatives.

* When displaying files to the user in a viewer, always look for the thing tagged "Service File".

* When the Original File is the file that you want displayed in a viewer, also tag it "Service File". 

* When displaying a download link, always (at least) look for the thing tagged "Original File". 

I think that it would help us to be more consistent across the various types of content, and easier to figure out why certain things may or may not be happening. This has already been implemented in the Starter Site, though without sample content it's hard to see. And I wanted to be out in the open about this, as it's a bit of a semantic change.

Discussion welcome.

Rosie

[Mark Jordan]

Hi Rosie, excellently expressed. +1 from me.

Mark

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[Seth Shaw]

We were doing a mix of the two approaches @ UNLV. All of our PDF originals were also being tagged as service files.

Another thing we were doing for images specifically, because not every node with an original file was getting a service file, was using the EVA to take either​ the service file or​ original file, whichever was smaller. (I.e. sort by size ascending, limit 1.)

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Subject: Re: [islandora] A proposal regarding Media Use terms

 

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[Rosie Le Faive]

In the case of large images, the default has been the opposite: Create a jpeg "service file", but then display the "original file" in a zoomable browser. It's not clear why we needed the service file to exist - completeness, maybe? An additional download format? 

Maybe the default (EVA that displays the file-in-the-viewer) could be to display the service file, but if one does not exist, fall back to the original file? That's do-able.