In couchbase 6.0 can we create a user defined namespace?

We have a default namespace that contains all the buckets, but I need to know if we can create a user defined namespace in couchbase.
There are a few discussions and some official document, but none actually answers the question.

There is not something currently called a “namespace” that is user defined in current releases, if I’m understanding your question correctly.

Through current release (Couchbase Server 6.6), you would use a type= , a key scheme or another attribute to define any logical grouping of documents within a bucket.

A future release is going to have a couple of features, scopes and collections as written about on the blog. This is enable-able as a Developer Preview feature in 6.5 and 6.6 right now. See the docs for more details.