MathML
MathML may be included in the title, subtitle, original_language_title, and abstract elements. The MathML namespace (mml) must be defined in the schema declaration, for example:
<doi_batch xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.crossref.org/schema/4.4.2 https://data.crossref.org/schemas/crossref4.4.2.xsd"
xmlns="http://www.crossref.org/schema/4.4.2" xmlns:jats="http://www.ncbi.nlm.nih.gov/JATS1"
xmlns:mml="http://www.w3.org/1998/Math/MathML">
Note that all MathML markup must include an mml namespace prefix:
<journal_article publication_type="full_text">
<titles>
<title>Selectron production at an <mml:math><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> linear collider with transversely polarized beams</title>
</titles>
