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Journal Article Tag Sets

National Library of Medicine (NLM) releases for public use:

Goal Preserve the intellectual content of journal articles
Scope Journal article-level content (research articles, editorials, columns, reviews, letters, etc.)
  Original metadata (journal, issue), full content, extended metadata (indexing, links, etc.)
Non-goals / Out of Scope Full journals, Format-specific look and feel elements, Administrative content (TOC, masthead, etc.), Display advertising, Classifieds
Initial release March 2003, incrementally updated since

Now defacto standard for journal article interchange and archives