Any combination of:

• Text, numbers, or special characters

• <email> Email Address

• <ext-link> External Link

• <uri> Uniform Resource Indicator (URI)

• <inline-supplementary-material> Inline Supplementary Material

• <related-article> Related Article Information

• <related-object> Related Object Information

• <hr> Horizontal Rule

• <bold> Bold

• <italic> Italic

• <monospace> Monospace Text (Typewriter Text)

• <overline> Overline

• <overline-start> Overline Start

• <overline-end> Overline End

• <roman> Roman

• <sans-serif> Sans Serif

• <sc> Small Caps

• <strike> Strike Through

• <underline> Underline

• <underline-start> Underline Start

• <underline-end> Underline End

• <alternatives> Alternatives For Processing

• <inline-graphic> Graphic, Inline

• <private-char> Private Character (Custom or Unicode™)

• <chem-struct> Chemical Structure (Display)

• <inline-formula> Formula, Inline

• <tex-math> TeX Math Equation

• <mml:math> Math (MathML 2.0 Tag Set)

• <abbrev> Abbreviation or Acronym

• <milestone-end> Milestone End

• <milestone-start> Milestone Start

• <named-content> Named Special (Subject) Content

• <styled-content> Styled Special (Subject) Content

• <fn> Footnote

• <target> Target of an Internal Link

• <xref> X (cross) Reference

• <sub> Subscript

• <sup> Superscript

• <x> X - Generated Text and Punctuation

• <break> Line Break