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Start Refers to the first document in a collection of documents. This link type tells search engines which document is considered by the author to be the starting point of the collection.
Next Refers to the next document in a linear sequence of documents. User agents may choose to preload the "next" document, to reduce the perceived load time.
Prev Refers to the previous document in an ordered series of documents. Some user agents also support the synonym "Previous".
Contents Refers to a document serving as a table of contents. Some user agents also support the synonym ToC (from "Table of Contents").
Index Refers to a document providing an index for the current document.