Type of Link


Identifies the kind of link used with an element. For all elements in this DTD that can take links (except the <mml:math> element), this attribute uses the fixed (unchanging) value “simple”, which means that the link is a simple, one-ended link. For the <mml:math> element, the attribute may take any value that describes the link type, for example, a “simple” (one-ended) link, a “locator” link, a “title” link, an “extended” (multi-way) link, etc.


For all elements (except <mml:math>), the value of the attribute is the word “simple” and cannot be changed; it is intended for use by software. For the <mml:math> element, the attribute may take any value, but best practice will restrict the value to one defined in the MathML and XLink specifications; see them for further details.

Attribute Values

In Element

<mml:math> Math (MathML 2.0 DTD)
Value Meaning
Text, numbers, or special characters A descriptive name for the type of link present, e.g., “simple” for an XML simple (one-ended) link, “extended” for a multi-way link, etc.
Restriction: This attribute may be specified if the element is used.

In Elements

<abbrev> Abbreviation or Acronym; <bio> Biography; <chem-struct> Chemical Structure (Display); <citation> Citation; <collab> Collaborative (Group) Author; <contract-num> Contract/Grant Number; <contract-sponsor> Contract/Grant Sponsor; <contrib> Contributor; <email> Email Address; <ext-link> External Link; <graphic> Graphic; <inline-graphic> Graphic, Inline; <inline-supplementary-material> Inline Supplementary Material; <institution> Institution Name: in an Address; <license> License Information; <media> Media Object; <named-content> Named Special (Subject) Content; <product> Product Information; <related-article> Related Article Information; <self-uri> URI for This Same Article Online; <supplementary-material> Supplementary Material; <uri> Uniform Resource Indicator (URI)
Value Meaning
simple The link is an XML simple (one-ended) link. (Although this is one of several valid XLink link types, it is the only value permitted by the default DTD Suite.)
Restriction: This attribute value may not be changed.