<!ELEMENT  journal-subtitle
                        (#PCDATA %journal-title-elements;)*          >

Description

Any combination of:

• Text, numbers, or special characters
• All the address linking elements:
  • Email Address <email>
  • External Link <ext-link>
  • Uniform Resource Indicator (URI) <uri>
• All the article linking elements:
  • Inline Supplementary Material <inline-supplementary-material>
  • Related Article Information <related-article>
• Font <font>
• Horizontal Rule <hr>
• All the emphasis elements:
  • Bold <bold>
  • Italic <italic>
  • Monospace Text (Typewriter Text) <monospace>
  • Overline <overline>
  • Overline Start <overline-start>
  • Overline End <overline-end>
  • Sans Serif <sans-serif>
  • Small Caps <sc>
  • Strike Through <strike>
  • Underline <underline>
  • Underline Start <underline-start>
  • Underline End <underline-end>
• Graphic, Inline <inline-graphic>
• Private Character (Custom or Unicode) <private-char>
• Formula, Inline <inline-formula>
• Tex Math Equation <tex-math>
• Math (Mathml 2.0 Tag Set) <mml:math>
• Abbreviation or Acronym <abbrev>
• Milestone End <milestone-end>
• Milestone Start <milestone-start>
• Named Special (Subject) Content <named-content>
• All the simple link/cross-referencing elements:
  • Footnote <fn>
  • Target of an Internal Link <target>
  • X(cross) Reference <xref>
• Subscript <sub>
• Superscript <sup>