In a group lab, my colleagues and I created the following metadata schema, which you can find below.
The MEI file was edited based on the scheme parameters above. Below you can see the code snippet from the MEI-Friend editor. The file is available for download here.
<titleStmt xml:id="title">
<title auth.uri="https://lccn.loc.gov/n00063915" auth="Library of Congress" xml:id="m-8"> Spiegel im Spiegel (1978)</title>
<title xml:id="subtitle1" type="subtitle"> An arrangement for piano </title>
<title type="label" auth.uri="https://lccn.loc.gov/no2007083328" auth="Library of Congress" xml:id="subtitle"> ECM Records </title>
<composer xml:id="composer"> Arvo Pärt </composer>
<arranger xml:id="arranger1"> Alexander Malter </arranger>
<arranger xml:id="arranger2"> Sergej Bezrodny </arranger>
<respStmt>
<resp> Encoded by </resp>
<name> Anastasiia Kolodka </name>
</respStmt>
</titleStmt>