The attribute sets that you use to format the appearance of links are found in links-attr.xsl. Here is a list of those attributes along with their purpose and what XSLT stylesheets they are called from.
|Attribute set||Purpose||Called from|
|link||Formats text in the link element. Text of link (excluding page reference) can be overridden by linktext attribute set.||links.xsl|
|link__content||Formats text of link (excluding page reference) and ...|