Any combination of:

• Text, numbers, or special characters

• Linking Elements

  • <email> Email Address

  • <ext-link> External Link

  • <uri> Uniform Resource Identifier (URI)

• <inline-supplementary-material> Inline Supplementary Material Metadata

• Related Material Elements

  • <related-article> Related Article Information

  • <related-object> Related Object Information

• Emphasis Elements

  • <bold> Bold

  • <fixed-case> Fixed Case

  • <italic> Italic

  • <monospace> Monospace Text (Typewriter Text)

  • <overline> Overline

  • <roman> Roman

  • <sans-serif> Sans Serif

  • <sc> Small Caps

  • <strike> Strike Through

  • <underline> Underline

  • <ruby> Ruby Annotation Wrapper

• <alternatives> Alternatives For Processing

• Inline Display Elements

  • <inline-graphic> Graphic, Inline

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

• <chem-struct> Chemical Structure (Display)

• <inline-formula> Formula, Inline

• Math Elements

  • <tex-math> TeX Math Equation

  • <mml:math> Math (MathML Tag Set)

• Other Inline Elements

  • <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

• Baseline Change Elements

  • <sub> Subscript

  • <sup> Superscript

• <break> Line Break

• Citation Elements

  • <citation-alternatives> Citation Alternatives

  • <element-citation> Element Citation

  • <mixed-citation> Mixed Citation

  • <nlm-citation> NLM Citation