As described in HTML4 Metadata profiles.
HTML4 definition of the ‘rel’ attribute. Below are some additional values, each of which can be used or omitted in any combination (unless otherwise indicated and unless prohibited by law) and their meanings, symmetry, transitivity And reverse if applicable. Please see the XFN home page for more information on XFN.
friendship (choose at most one)
- Someone you know how to connect with. Often symmetrical.
- Someone you have exchanged greetings with and not much (if any) more, maybe a short conversation or two. Often symmetrical.
- Someone you are friends with. A compatriot, friend, homemaker you know. Often symmetrical.
- Someone you’ve actually met in person. Symmetrical.
- Someone with whom a person works or works in the same organization with whom. Symmetrical. Usually transitive.
- Someone in the same field of study / activity. Symmetrical. Often transitive.
geographic (choose at most one)
- Someone you share an address with. Symmetrical and transitive.
- Someone who lives nearby, perhaps only at an adjacent address or door. Symmetrical. Often transitive.
family (choose at most one)
- The genetic offspring of a person or someone that a person has adopted and cared for. The reverse is parent.
- Reverse of child.
- Someone with whom a person shares a parent. Symmetrical. Usually transitive.
- Someone you are married to. Symmetrical. Not transitive.
- A relative, someone you consider part of your extended family. Symmetrical and typically transitive.
- Someone who brings you inspiration. No inverse.
- Someone you have a crush on. No inverse.
- Someone you’re dating. Symmetrical. Not transitive.
- Someone you are intimate with and at least somehow engaged with, typically exclusively. Symmetrical. Not transitive.
- A link to yourself to a different URL. Excludes all other XFN values. Symmetrical required. There is an implicit “me” relationship from the contents of a directory to the directory itself.
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