http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
1. The ancient world -- 2. The middle ages -- 3. The fifteenth century -- 4. The sixteenth century -- 5. The seventeenth century -- 6. The eighteenth century -- 7. The nineteenth century -- 8. The twentieth century and beyond