BITS 0.2
( #PCDATA | alt-text | long-desc | email | ext-link | uri | inline-supplementary-material
| related-article | related-object | hr | bold | italic | monospace | overline | overline-start
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underline-end | alternatives | inline-graphic | private-char | chem-struct | inline-formula
| tex-math | mml:math | abbrev | index-term | index-term-range-end | milestone-end
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| x | attrib | permissions )*
BITS 1.0
( #PCDATA | alt-text | long-desc | email | ext-link | uri | inline-supplementary-material
| related-article | related-object | hr | bold | fixed-case | italic | monospace |
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| underline-start | underline-end | ruby | alternatives | inline-graphic | private-char
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BITS 2.0
( #PCDATA | alt-text | long-desc | email | ext-link | uri | inline-supplementary-material
| related-article | related-object | hr | bold | fixed-case | italic | monospace |
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| underline | underline-start | underline-end | ruby | alternatives | inline-graphic
| private-char | chem-struct | inline-formula | tex-math | mml:math | abbrev | index-term
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BITS 2.1
( #PCDATA | alt-text | long-desc | email | ext-link | uri | inline-supplementary-material
| related-article | related-object | hr | bold | fixed-case | italic | monospace |
overline | overline-start | overline-end | roman | sans-serif | sc | serif | strike
| underline | underline-start | underline-end | ruby | alternatives | inline-graphic
| inline-media | private-char | chem-struct | inline-formula | tex-math | mml:math
| abbrev | index-term | index-term-range-end | milestone-end | milestone-start | named-content
| styled-content | fn | target | xref | sub | sup | x | attrib | permissions )*