<underline>
Underline
Used to mark text that should appear with a horizontal line beneath it.
Remarks
This is normally a print consideration — not a matter for XML tagging — as underlining is frequently prohibited in online works, since it is a common “this is a link” signal.
Emphasis as a Toggle Switch:
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
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
Content Model
<!ELEMENT underline (#PCDATA %emphasized-text;)* >
Expanded Content Model
(#PCDATA | email | ext-link | uri | inline-supplementary-material | related-article | related-object | bold | fixed-case | italic | monospace | overline | roman | sans-serif | sc | strike | underline | 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)*
Description
Any combination of:
- Text, numbers, or special characters
- Linking Elements
- Related Material Elements
- Emphasis Elements
- <alternatives> Alternatives For Processing
- Inline Display Elements
- Inline Math Elements
- Math Elements
- Other Inline Elements
- Internal Linking Elements
- Baseline Change Elements
This element may be contained in:
<addr-line>, <aff>, <alt-title>, <article-title>, <attrib>, <award-id>, <bold>, <chapter-title>, <chem-struct>, <code>, <collab>, <comment>, <compound-kwd-part>, <compound-subject-part>, <conf-theme>, <copyright-statement>, <corresp>, <data-title>, <def-head>, <disp-formula>, <element-citation>, <ext-link>, <fixed-case>, <funding-source>, <funding-statement>, <gov>, <inline-formula>, <inline-media>, <inline-supplementary-material>, <italic>, <kwd>, <label>, <license-p>, <meta-value>, <mixed-citation>, <monospace>, <named-content>, <on-behalf-of>, <overline>, <p>, <part-title>, <preformat>, <price>, <product>, <rb>, <related-article>, <related-object>, <resource-name>, <role>, <roman>, <sans-serif>, <sc>, <see>, <see-also>, <series>, <series-text>, <series-title>, <sig>, <sig-block>, <source>, <std>, <strike>, <styled-content>, <sub>, <subject>, <subtitle>, <sup>, <supplement>, <support-source>, <target>, <td>, <term>, <term-head>, <textual-form>, <th>, <title>, <trans-source>, <trans-subtitle>, <trans-title>, <underline>, <verse-line>, <xref>
Example
... <p>... Oligonucleotide primers for the amplification of TbH4 included 5′-ATTAGGT<italic>CAT</italic><underline><italic>ATG</italic> </underline><bold>CACCATCACCATCACCAT</bold>ACGCAGTCGCAGACCGTGACGG and 3′-TATAGG<italic>AAGCTT</italic>CTAATCCTCGGTGTAGAGCGCCTCG. XP-1 was amplified with 5′-CAATTA<italic>CAT</italic><underline> <italic>ATG</italic></underline><bold>CATCACCATCACCATCAC</bold> AACGACGGCGAAGGAACTGTGC and 3′-AACCTG<italic>GAATTC</italic>GTCCATGCTCACTTCGAC, and the 38-kDa antigen was amplified with 5′-CAATTA<italic>CAT</italic> <underline><italic>ATG</italic></underline><bold>CATCACCATCACCATCAC</bold> TGTGGCTCGAAACCACCGAGC and ...</p> ...