Primary title for item with multiplentitles is not displaying on Purl

[andrewjbtw]

The purl for the "[North Korean poster collection]" is displaying only the Korean-language parallel/alternative titles on the Purl:

However, there's an English-language title in the metadata and designated as "primary":

<titleInfo type="alternative" altRepGroup="1">
      <title>[Pukhan p'osŭt'ŏ k'ŏlleksyŏn]</title>
    </titleInfo>
    <titleInfo type="alternative" altRepGroup="1">
      <title>[북한 포스터 컬렉션]</title>
    </titleInfo>
    <titleInfo usage="primary">
      <nonSort>[ </nonSort>
      <title>North Korean poster collection]</title>
    </titleInfo>

This title does not appear anywhere in the Purl, even in the bibliographic information.

In Searchworks, the primary title is in the header and the parallel titles are in the bibliographic information section down below. Since the origin of the description on the Purl is the same MARC record used to display the title in SearchWorks, it seems like the Purl display should also use the same title at the top of the page.

[andrewjbtw]

I experimented in stage with moving the primary title to be listed first in the MODS and that did result in that title appearing at the top of the Purl. I'm not sure if that means the MARC-to-MODS transformation in SDR should always put that title first, if present. I'm also not sure that would be possible.

[cbeer]

This seems like a PURL issue, not a mods_display one?

[andrewjbtw]

I wasn't sure which repo to put it in. I think I can move it.

[andrewjbtw]

I guess I don't have permissions to move issues between these repos, so I re-posted as https://github.com/sul-dlss/purl/issues/673