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Elements Identify Many Kinds of Content

(No limit to the number of possible elements)

Structure What part of the document? (article, title, paragraph, list, footnote)
Metadata About the document (issue number, first page, article title, DOI, journal abbreviation)
Named content What is this text/data? (genus-species, surname, glossary, gene, question and answer)
Navigation/Links Value-added for searching/linking (bibliographic citations; links to other articles, index terms, related material; figure references)
Presentation How text should look (typographic emphasis, superscript, forced line breaks)