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<bold> Bold

Used to mark text that should appear in bold face.

Usage/Remarks

Emphasis as a Toggle

The @toggle attribute controls the behavior of this element. When the value of @toggle is set to “no”, the emphasized text remains in the requested style, no matter what the surrounding text does. When the value of @toggle is “yes”, if the surrounding text is set to the same emphasis style, the text within this element will change to another emphasis style, so that the text will always be typographically distinct from its surroundings.
Using the element <italic> as an example, setting the @toggle attribute to “no” would mean that a material marked as italics will always be italics, even in an italic context. In contrast, if the @toggle attribute was set to “yes” on the <italic> element, if the formatting context imposes italics (whether due to another <italic> element, a stylesheet, some CSS, or other means), then the italics would be turned off within that context, making the emphasized text emphasized by contrast, but not italic. The <italic> element would still produce italics everywhere else.
Attributes
specific-use
toggle

Base Attributes

id
xml:base
Models and Context
May be contained in
<abbrev>, <addr-line>, <aff>, <alt-title>, <anonymous>, <article-title>, <attrib>, <award-id>, <bold>, <book-title>, <book-volume-id>, <book-volume-number>, <chapter-title>, <chem-struct>, <code>, <collab>, <comment>, <compound-kwd-part>, <compound-subject-part>, <conf-acronym>, <conf-loc>, <conf-name>, <conf-num>, <conf-sponsor>, <conf-theme>, <copyright-statement>, <corresp>, <data-title>, <date-in-citation>, <def-head>, <degrees>, <disp-formula>, <edition>, <element-citation>, <email>, <etal>, <ext-link>, <fax>, <fixed-case>, <funding-source>, <funding-statement>, <given-names>, <gov>, <inline-formula>, <inline-media>, <inline-supplementary-material>, <institution>, <issue>, <issue-part>, <issue-title>, <italic>, <kwd>, <label>, <license-p>, <meta-name>, <meta-value>, <mixed-citation>, <monospace>, <named-content>, <nav-pointer>, <on-behalf-of>, <overline>, <p>, <part-title>, <patent>, <phone>, <prefix>, <preformat>, <price>, <product>, <publisher-loc>, <publisher-name>, <rb>, <related-article>, <related-object>, <resource-name>, <role>, <roman>, <sans-serif>, <sc>, <see>, <see-also>, <see-also-entry>, <see-entry>, <self-uri>, <series>, <serif>, <sig>, <sig-block>, <source>, <speaker>, <std>, <std-organization>, <strike>, <string-conf>, <string-date>, <string-name>, <styled-content>, <sub>, <subject>, <subtitle>, <suffix>, <sup>, <supplement>, <support-source>, <surname>, <target>, <td>, <term>, <term-head>, <textual-form>, <th>, <title>, <trans-source>, <trans-subtitle>, <trans-title>, <underline>, <unstructured-kwd-group>, <uri>, <verse-line>, <version>, <volume>, <volume-id>, <volume-series>, <volume-title>, <x>, <xref>
Description
Any combination of:
Content Model
<!ELEMENT  bold         (#PCDATA %emphasized-text;)*                 >
Expanded Content Model

(#PCDATA | 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 | break)*

Tagged Samples
Highlighting phrase in text 
...
<p>There are many possible types of names that can be
 associated with an organism taxid in TAXON. To track and
 display the names correctly, the various names associated
 with a taxid are tagged with a nametype, for example
 &ldquo;scientific name&rdquo;, &ldquo;synonym&rdquo;,
 or &ldquo;common name&rdquo;. Each taxid <bold>must have
 one</bold> (and only one) scientific name but may have
 zero or many other names (for example, several synonyms,
 several common names, along with only one &ldquo;GenBank
 common name&rdquo;).</p>
...
Highlighting a table cell 
...
<table frame="box" rules="all" cellpadding="5">
 <thead>
  <tr>
   <td>Functional Category</td>
   <td>Gene or Operon</td>
   <td>&sigma; Factor<sup>a</sup></td>
   <td>Activated by<sup>b</sup></td>
   <td>Repressed by</td>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>Engulfment</td>
   <td><italic>spoIID</italic></td>
   <td><bold>&sigma;<sup>E</sup></bold></td>
   <td></td>
   <td><bold>SpoIIID</bold></td>
  </tr>
  <tr>
   <td></td>
   <td><italic>spoIIM</italic></td>
   <td><bold>&sigma;<sup>E</sup></bold></td>
   <td></td>
   <td>GerR</td>
  </tr>
  ...
 </tbody>
</table>
...