Using a sub-namespace with composer?

[NotionCommotion]

I've only seen composer packages using vendor name and package name namespace.

Is it possible to use deeper namespace such as the following?

For instance, package:

{
    "name": "notioncommotion/my-sub-namespace/my-package",
    "description": "MyPackage located in MySubNamespace.",
    ...
}

is used in some project:

{
    "require": {
        "notioncommotion/my-sub-namespace/my-package": "^1.2"
    }
}

If not, what do you think were the reasons composer does not allow?

Thanks

[requinix]

It isn't a namespace. It's a vendor name plus a slash plus a project name.

[NotionCommotion]

21 hours ago, requinix said:

It isn't a namespace. It's a vendor name plus a slash plus a project name.

Bad terminology on my side, but ultimately it maps to a namespace.  And it seems that sometimes it is a vendor name +/+ project name and other times it is a vendor's project name +/+ sub-project.  For instance, react used with react/http-client and react/http seems to be more of a project or library than a vendor name.  Don't know where I am going with this, and guess it doesn't matter...

[requinix]

You can use whatever namespaces, actual PHP code namespaces, that you want. But the composer project is you + one name.