资源：http://gmpg.org/xfn/

作用：定义链接的关系(如朋友、家庭，是否见过面等)，可用于友情链接，博客的blogroll等

XFN 1.1 Creator: http://gmpg.org/xfn/creator

添加XFN:
1 准备好链接网址
2 在<a>中添加rel="friend met colleague"等属性
<a href="http://tanya.example.org" rel="friend met colleague">...
3 为了让人家知道你支持XFN， 在<head>中添加profile="http://gmpg.org/xfn/11"属性
<head profile="http://gmpg.org/xfn/11">
4 添加Support标签，这个由你喜欢
<a href="http://gmpg.org/xfn"><img src="xfn-btn.gif" alt="XFN Friendly" /></a>
5 Add Your Site to Rubhub(关系查看引擎)
http://rubhub.com/main/add

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friendship: 选一

contact(知道怎么联系) Often symmetric
acquaintance(认识的,比如谈过话) Often symmetric
friend(朋友) Often symmetric

physical:

met(见过面) symmetric

professional: 可多选

co-worker(同一单位工作) Symmetric[指关系对称]. Usually transitive.
colleague(同事,Someone in the same field of study/activity.) Symmetric. Often transitive.

geographical: 选一

co-resident(同居) Symmetric and transitive.
neighbor(邻居) Symmetric. Often transitive.

family: 选一

child(连接向我的孩子) Inverse(对称方) is parent.
parent(连接向我的父母)
sibling(连接向兄弟姐妹) Symmetric. Usually transitive
spouse(配偶) Symmetric. Not transitive.
kin(亲属) Symmetric and typically transitive.

romantic: 可多选

muse(思念) No inverse
crush(心酸) No inverse
date(约会) Symmetric. Not transitive
sweetheart(甜心) Symmetric. Not transitive.

identity:

me(自己的) Exclusive of all other XFN values. Required symmetric.

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