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.
|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.|
|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.|