Hi Chathura!
Well Glen's suggestion was that this is not needed and that a resource
can be tagged multiple times with the same tag. The bug is really that
the registry throws an exception when this is attempted. Glen and
Jonathan might have more details on this.
A resource can be tagged with the same tag by multiple users. But IMHO
we shouldn't allow the *same user* to tag a resource multiple times with
the same tag. It breaks some concepts of taggings. We use tag count
(number of taggings done on a resource using a tag) as a method to
determine the relevance of a tag to a resource. We highlight the tags in
the tag cloud according to the tag count. If we allow the above
scenario, a user can tag his resource with the same tag multiple times
and artificially increase the tag count of that resource. This could
mislead other users about the relevance of that tag on that resource.
Nope. :)
Tagging through the Java API or the Web protocol should be a repeatable,
idempotent operation. We should not be incrementing the "tag count"
when a user tags a resource that they've already tagged with the same
string - and the back-end should take care of this for us transparently.
Asking the client to do it is unnecessary and error-prone (as we've
seen from the Mashup team's issue).
pseudocode JDBCReg:tag(path, tag) {
if (exists(path, tag, currentUser)) return;
put new tagging(path, tag, currentUser) in db;
}
pseudocode RemoteReg:tag(path, tag) {
// Always just post, since you can only have one of this tag per user
POST(path + ";tags", "tag=" + tag);
}
Thanks,
--Glen
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