Overline Start


The start of a milestone-created overline


The Overline Start and Overline End elements act as milestone tags marking the start and end of overlining that may extend across element boundaries. This element was modeled on one in the Elsevier DTD, for use 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 tag (<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"/>


id Identifier

Related Elements

The Overline is used for ordinary overlining. For special overlines, involving 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.

Model Information

Content Model

<!ELEMENT  overline-start
                        EMPTY                                        >


This is an EMPTY element

This element may be contained in:

<addr-line> Address Line; <aff> Affiliation; <alt-title> Alternate Title; <article-title> Article Title; <attrib> Attribution; <bold> Bold; <book-title> Book Title; <chem-struct> Chemical Structure (Display); <citation> Citation; <collab> Collaborative (Group) Author; <collection-name> Collection Name; <comment> Comment in a Citation; <conf-loc> Conference Location; <conf-name> Conference Name; <copyright-statement> Copyright Statement; <corresp> Correspondence Information; <def-head> Definition List: Definition Head; <degrees> Degree(s); <disp-formula> Formula, Display; <edition> Edition, Cited; <etal> Et Al; <ext-link> External Link; <fax> Fax Number: in an Address; <font> Font; <given-names> Given (First) Names; <gov> Government Report, Cited; <inline-formula> Formula, Inline; <inline-supplementary-material> Inline Supplementary Material; <institution> Institution Name: in an Address; <issue> Issue Number; <italic> Italic; <kwd> Keyword; <label> Label (Of a Figure, Reference, Etc.); <meta-name> Metadata Data Name for Custom Metadata; <meta-value> Metadata Data Value for Custom Metadata; <monospace> Monospace Text (Typewriter Text); <named-content> Named Special (Subject) Content; <on-behalf-of> On Behalf of; <overline> Overline; <p> Paragraph; <patent> Patent Number, Cited; <phone> Phone Number: in an Address; <prefix> Prefix; <preformat> Preformatted Text; <publisher-loc> Publisher’s Location; <publisher-name> Publisher’s Name; <related-article> Related Article Information; <related-object> Related Object Information; <role> Role or Function Title of Contributor; <sc> Small Caps; <series> Series; <source> Source; <std> Standard, Cited; <strike> Strike Through; <sub> Subscript; <subject> Subject Grouping Name; <subtitle> Subtitle; <suffix> Suffix; <sup> Superscript; <supplement> Supplement Information; <surname> Surname; <target> Target of an Internal Link; <td> Table Data Cell (XHTML table model); <term> Definition List: Term; <term-head> Definition List: Term Head; <th> Table Header Cell (XHTML table model); <title> Title; <trans-source> Translated Source; <trans-subtitle> Translated Subtitle; <trans-title> Translated Title; <underline> Underline; <uri> Uniform Resource Indicator (URI); <verse-line> Line of a Verse; <volume> Volume Number; <volume-id> Volume Identifier; <xref> X(cross) Reference

Tagged Example

No sample is available at this time.