<overline-start> Overline Start

Milestone indicating the beginning of overline emphasis.

Usage/Remarks

The <overline-start> and <overline-end> elements act as milestone tags marking the start and end of overlining that may extend across element boundaries, mostly within mathematics, when ordinary MathML underline and overline functions are inadequate.
The <overline-start> and <overline-end> elements enable creation of overlines in content, most commonly in mathematical content, where a normal overline element (<overline>) would break the XML well-formedness rule that no two elements may overlap. The overline created using these two elements can have arbitrary start and end points because the start and end elements are paired through the use of the unique identifiers (IDs), not as the start and end of a single element. For example, in the text “ABCD”, if the text “ABC” is to be overlined and the text “CD” is to be underlined, ordinary overlining with the <overline> element would create invalid tag overlap. The text could be correctly tagged, using the <overline-start> and <overline-end> elements, as:
...
<overline-start id="ov1"/>AB
<underline-start id="ul1"/>C
<overline-end rid="ov1"/>D
<underline-end rid="ul1"/>
...
Related Elements
The <overline> is used for ordinary overlining. For overlines that involve problems with element overlap, use the milestone elements <overline-start> and <overline-end>.
When a milestone overlining technique is used, the start of the overline will be marked by an <overline-start> element, and the end of the overline will be marked by an <underline-end> element.
Attributes

Base Attributes

id (REQUIRED)
Models and Context
May be contained in
<abbrev>, <abbrev-journal-title>, <addr-line>, <aff>, <alt-title>, <anonymous>, <article-title>, <attrib>, <award-id>, <bold>, <chapter-title>, <chem-struct>, <code>, <collab>, <collab-name>, <comment>, <compound-kwd-part>, <compound-subject-part>, <conf-acronym>, <conf-date>, <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>, <history>, <inline-formula>, <inline-media>, <inline-supplementary-material>, <institution>, <issue>, <issue-part>, <issue-sponsor>, <issue-subtitle>, <issue-title>, <italic>, <journal-subtitle>, <journal-title>, <kwd>, <label>, <license-p>, <meta-name>, <meta-value>, <mixed-citation>, <monospace>, <named-content>, <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>, <self-uri>, <series>, <series-text>, <series-title>, <sig>, <sig-block>, <size>, <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>, <x>, <xref>
Description
This is an EMPTY element
Content Model
<!ELEMENT  overline-start
                        EMPTY                                        >