As described in the 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 specified and where prohibited by law) and their meaning, symmetry, transitivity is reverse if present. 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 to and not much (if any) more – maybe a short conversation or two. Often symmetrical.
- Someone you are friends with. A fellow countryman, friend, at home (boy | girl) you know. Often symmetrical.
- Someone you’ve actually met in person. Symmetrical.
- Someone who works with or works in the same organization as. 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 on an adjacent street 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. Inverse is a parent.
- Reverse of the 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 to inspire you. No inverse.
- Someone you have a crush on. No inverse.
- Someone you date. Symmetrical. Not transitive.
- Someone you are intimate with and at least somehow engaged with, typically exclusively. Symmetrical. Not transitive.
- A link to yourself at a different URL. Exclusive to all other XFN values. Symmetrical required. There is an implicit “I” relationship from the contents of a directory to the directory itself.
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