[USE CASE] Complex (Structured) Titles and other special Title features

[rosiel]

Overview of Use Case

Starting this issue as a place to store various work that has been done around structured titles, in the hope of making some sort of solution - informal recipe, formal recipe, module, etc. There's no general use case, as some people may need titles divided some ways and others may not. For example, do you need:

• nonsort characters explicitly enumerated? and naturally, views/solr sorting of the full titles without those characters?
• a subtitle? That is displayed in the browser as a subtitle, subordinate to the main title?
• part names and/or numbers? That are displayed in the browser as subordinate to the main title?
• Views and node displays that show the full title (assembled from multiple parts with appropriate punctuation)

Other things include:

• a title/subtitle of non-constrained length (>500 characters)? Perhaps there are places where it needs to be truncated for display? (perhaps not a paragraph of <h1> text).
• HTML In titles (PR)
• Equations in titles

Examples:

ASU

https://github.com/asulibraries/islandora-repo/blob/develop/web/modules/custom/asu_default_fields/asu_default_fields.module#L133-L157

• splits into nonSort, title, subtitle using a Paragraph.
• on node_presave, assembles the parts into the node's title proper (trimming to 255 char)