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Example a Wide Format JDF Layout job (Layout with front/backs using Ord to map to RunList entries).

PDF may contain sequential front/back sequences or first all front then all back. In case of Wide Format often also TIFF, PNG or JPEG format which can contain only a single page.

What is the best way to indicate in the RunList which is the back page that matches a certain front page?
A unique identifier that is the same for both would already help if the pages are in different run partitions. What if front/back in the same PDF?

In the Layout element they are in a different partition but difficult to find the matching back page just based on similar coordinates (sometimes the back is mirrored).

PageList also did not help much.

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      a RunList would be the wrong place to indicate front or back, since a runlist is a pool of pages for use anywhere. The Layout or LayoutPreparationParams pulls data from the pool. The Layout can pull the same RunList page multiple times for different purpose eg, Ord 0 can be called from the first layout on the front, the first layout on the back, the last layout on the front etc. The RunList is not driving the layout, the layout is driving the process, pulling pages from the runlist..

      hope that helps

      1. Koen Van de Poel

        I understand that concept, but sometimes it would be helpful to have this as meta info since difficult to extract from the Layout.

        • using matching coordinates is not reliable
        • but maybe specifying in the PlacedObject the same AssemblyIDs for related Front/Back could help?

        Is there some attribute in the RunList that is candidate to indicate that two pages are related?

      2. martin goodall

        the problem though with the proposal is that a metadata example would work in the simple case, similar to what you describe, but not in the complex case, similar to my example, where a runlist page is used for multiple purposes. therefore, the metadata could not be used by a processor as it could not be relied upon for accuracy.

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