Uniqueness of uniqueness of packages for applications?

Question

When creating an Android application, we need to specify the package name in the manifest.

<manifest
  xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.me.foo">

I believe that this uniquely identifies the application, so we cannot upload the application to the market if another application already exists with the same package name.

Is it possible to renew the package name without collision? For instance:

package="com.me.foo"
package="com.me.foo.grok"

Will the second application be accepted by the market, although this is a substring of the first package name?

thank

Answer 1

Yes, it works great.

Answer 2

I did not test this, but I would expect that I could do it, otherwise it would be ridiculously easy to block companies, for example, by creating com.microsoft, com.google, com, etc.