Metadata in English for a 'research article' (or tantamount) are required. Abstracting & Indexing services (Scopus, ERIH Plus, Web of Science et cetera) may reject a journal for their programdatabases, or even remove a once indexed journal from their list for this reason.

At least for the online version of an article this is the minimal requirement: 

• One abstract with a string of keywords in English, regardless the language of the article 
• A title or translated title in English, regardless the language of the article 
• Author affiliation(s) with, preferably, the author(s)' position within their institution and at least their department and/or faculty, institution name, city and country which should be complete as possible and author contact details (e-mail address) 

Detailed instructions, with some examples, are to follow shortly on this page. 

Production Editors shall do their utmost to complete such metadata in case they seem missing. Incomplete copy for that matter may be submitted to the journal compositor for styling in order to gain time. In that case the vendorBrill's vendors are kindly asked to "author query" for required elements that seem to be missing. An author query is included in a first proof (author proof), labeled with "AQ" in a box.

It must be noted that both Brill and vendors have access author data and translated titles in a growing number of cases (though not all!) as these are in Editorial Manager anyhow. For journal articles with an automatic transfer to RSuite, such metadata can be found in a small JATS file with in the same container as the copy.