top Refers to the root document in the hierarchy, so-called "home" or "top page." up Refers to the one step higher document in the hierarchy. contents Refers to a document serving as a table of contents. first Refers to the first document in a linear sequence of documents. prev Refers to the previous document in a linear sequence of documents. next Refers to the next document in a linear sequence of documents. last Refers to the last document in a linear sequence of documents. glossary Refers to a document providing a glossary of terms that pertain to the current document. appendix Refers to a document serving as an appendix in a collection of documents. help Refers to a document offering help about whole this website, like explanatory notes. copyright Refers to a copyright statement for the current document. alternate Designates a substitute version for the current document, or a web feed based on RDF, Resource Description Framework. stylesheet Refers to an external style sheet. This is used together with the link type "alternate" for user-selectable alternate style sheets. made Refers to the e-mail address of the author of the current document. This is used as the value of the rev attribute.