Type of Link

Identifies the kind of link used with an element. For all elements in this Tag Suite 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, best practice will restrict the value to one defined in the MathML and XLink specifications; see them for further details.

Attribute Values

In Element

Value Meaning
Data characters Text, numbers, or special characters.
Restriction: This attribute may be specified if the element is used.

In Elements

<abbrev>, <bio>, <chem-struct>, <collab>, <contrib>, <custom-meta>, <element-citation>, <email>, <ext-link>, <funding-source>, <graphic>, <inline-graphic>, <inline-supplementary-material>, <institution>, <license>, <media>, <mixed-citation>, <named-content>, <related-article>, <supplementary-material>, <uri>
Value Meaning
simple The link is an XML simple (one-ended) link.
Restriction: This attribute value may not be changed.