Identifies the kind of link used with an element. For all elements in this Tag Set 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.
            
         
       
      
         
         
            
            
            
               
                  | 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. | 
            
          
         
            <abbrev>, 
<award-group>, 
<award-id>, 
<bio>, 
<chem-struct>, 
<collab>, 
<contrib>, 
<ext-link>, 
<funding-source>, 
<funding-statement>, 
<graphic>, 
<inline-graphic>, 
<inline-supplementary-material>, 
<institution>, 
<license>, 
<media>, 
<mixed-citation>, 
<named-content>, 
<product>, 
<supplementary-material>
               
                  | 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 Suite.) | 
               
                  | Restriction: Restriction: This attribute value may not be changed. |