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google-code-export / thebigpicture

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Metadata tags sometimes need each other #23

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago 
Some IPTC tags may only be set when another one is set. This is for example
the case with ReferenceService, ReferenceDate and ReferenceNumber (2:45,
2:47, 2:50). The latter two may only be set if the first one is also set,
and need to follow the first one immediately.

Should we care about this? If yes, how should the user specify this? (The
tags are repeatable, so it's not simply possible to let a writer method
sort them.)

Original issue reported on code.google.com by p.edel...@gmail.com on 20 Mar 2007 at 7:50

GoogleCodeExporter commented 9 years ago 
This is also the case for ObjectDataPreviewFileFormat,
ObjectDataPreviewFileFormatVersion and ObjectDataPreviewData (2:200, 2:201 and
2:202). The first two may inly occur if the last one exists.

Original comment by p.edel...@gmail.com on 20 Mar 2007 at 8:04

GoogleCodeExporter commented 9 years ago 
This is not only the case in IPTC. In Exif, there are also the mandatory 
version numbers.
- GPSVersion
- ExifVersion

In IPTC, there is the mandatory Application Record Version.

Original comment by p.edel...@gmail.com on 10 Apr 2007 at 7:51