How to specify a startkey(where the key is compound) where one of the keys could take any value in couchbase

Compund key :

key:[“page name”,“year”,“month”,“day”,“hour”,“minute”]

startkey: [“can take any value”,“2013”,“4”,“15”,“1”,“0”]

endkey : [“can take any value”,“2013”,“4”,“15”,“1”,“0”]

Group level:1

Could anyone tell how to specify the first key that could take any value.