Text formatting support in titles by reference implementations

[castedo]

In the 1st edition of the BpDF spec, the criteria for <article-title> are that child elements are from the JATS element set {HYPERTEXT} = {<bold>, <italic>, <sup>, <sub>, <monospace>, <ext-link>, <xref>}.

With regard to the display of titles, I am thinking of adding Zotero using Crossref data as a reference implementation.

The only documentation I could find on text formatting support in Zotero is this page:
https://www.zotero.org/support/kb/rich_text_bibliography

And the Crossref has documentation for "Face markup"
https://www.crossref.org/documentation/schema-library/markup-guide-metadata-segments/face-markup/

which includes

bold (b), italic (i), underline (u), over-line (ovl), superscript (sup), subscript (sub), small caps (scp), and typewriter text (tt).

and MathML.

and the schema
https://www.crossref.org/documentation/schema-library/metadata-deposit-schema-5-4-0/
https://data.crossref.org/reports/help/schema_doc/5.4.0/index.html
appears to also allow tags of <em>, <strong>, and <font>.

So taking the intersection of these two suggests that wise criteria for a title is that child elements should stay within the set

<b>
<i>
<sub>
<sup>

Small cap would be a welcome enhancement however Zotero/HTML, Crossref, and JATS have three different approaches:

• Zotero/HTML/CSS does <span style="font-variant:small-caps;">
• Corssref does <scp>
• and JATS does <sc>

So for edition 2 of the spec and version 3 of epijats, I am inclined to not include/implement small cap yet, but hopefully later. I still have yet to hammer out exactly how to document <i> vs <italic> and <b> vs <bold> (in robust reader implementation the handling is clear) and which epijats should output by default starting in version 3.

[castedo]

Regarding <b>, my first hot take was it's dumb because titles are often in bold so putting bold inside a title should not be done. But it is done, and after further investigation, see #20, I still plan to keep <b> in article title text for BpDF and not have epijats strip it .