Kermeta provides package to structure models. So you can define packages and sub-package as deep as you want. There are two main ways to do this, as shown in examples 2 and 3 (below). If you want to define some classes in a package you may define them in a specific file and start this file with a package naming directive (followed by a semi-colon) like in the following example ^[2] .

Example 1 : 1 file.kmt == 1 package naming directive

// My file
package MyNewPackage;

class A { 
// ... 
}

class B {
// ... 
}

Here, classes A and B are defined in a package called "MyNewPackage". All classes defined in this file are under the scope of this package.

You can also define explicitly sub-packages using braces (see the following example):

Example 2 : Defining subpackages using braces

// file : MyPackage-part1.kmt
package MyPackage;

package subPackage1 
{
    class A 
    {
// ...
    }
}

package subPackage2
{
    class B
    {
// ...
    }
}

In this example, we define a main package called "MyPackage" which contains 2 sub-packages "subPackage1" and "subPackage2". The first one contains the A class and the second one the B class.

If you want, you can declare the same package in several files. You can also directly define subpackages in the package naming directive of your file (see example 1 above). In the following example, we define a new sub-package of "MyPackage" called "subPackage3" directly in the file. All features defined in this file will belong to this sub-package.

Example 3 : Defining subpackage using :: syntactic sugar

// file : subPackage3.kmt
package MyPackage::subPackage3;

class C 
{
// ...
}