## Composition by architecture modules

Each [architecture module and platform](platforms.md) can contribute code to any of the runtimes.
Not every module contributes to every runtime.

The core-runtime module defines each runtime:

- The target JVM for the runtime. Each runtime has its own JVM compatibility constraints.

  <modelVersion>4.0.0</modelVersion>
  <groupId>inheritance</groupId>
  <artifactId>empty</artifactId>
  <version>1</version>
  <modules>
    <module>child</module>
  </modules>
  <url></url>
  <scm>
    <connection> </connection>
    <developerConnection>  </developerConnection>
    <url></url>
  </scm>
  <distributionManagement>
    <site>
      <url></url>

 * limitations under the License.
 */

package okhttp3.modules.test;

import mockwebserver3.MockResponse;
import mockwebserver3.MockWebServer;
import okhttp3.Call;
import okhttp3.Headers;
import okhttp3.HttpUrl;
import okhttp3.OkHttpClient;
import okhttp3.Response;
import okhttp3.logging.HttpLoggingInterceptor;
import okhttp3.modules.OkHttpCaller;
import org.junit.jupiter.api.Test;

  // but it currently won't compile to a module-info.class file.
  // Note that module checking only works on JDK 9+,
  // because the JDK built-in base modules are not available in earlier versions.
  val javaVersion = compileKotlinTask.kotlinJavaToolchain.javaVersion.getOrNull()
  when {
    javaVersion?.isJava9Compatible == true -> {

            .java files in c.g.c.collect.Collect, a module that the c.g.c.base test module inherits,
            and .java files in c.g.c.collect.testModule, one that it doesn't[*]. Consequently,
            c.g.c.base.testModule transitively pulls in .java files from both modules while reading
            the module description of only the prod module. And the prod module doesn't inherit all
            the modules that the test module classes use, so we get errors.

  <name>Model urls inheritance test parent</name>
  <description>Most classical case: child in direct subdirectory with directory name == child artifactId</description>

  <modules>
    <module>child-artifact-id</module>
  </modules>

  <!-- 5 urls in the pom will be inherited with path added -->
  <url>http://www.apache.org/path/to/parent/</url>
  <scm>
    <connection>scm:my-scm:http://domain.org/base</connection>

    <version>11-SNAPSHOT</version>
  </parent>

  <groupId>inheritance</groupId>
  <artifactId>child-artifact-id</artifactId>
  <version>11-SNAPSHOT</version>
  <name>Model inheritance test parent: module directory != artifactId</name>
  <description>
    artifactId == "child-artifact-id"
    but expect path on SCM and site == "child"

  <name>Model urls inheritance test parent</name>
  <description>MNG-5951 MNG-6059 child.x.y.inherit.append.path="false" for each url to avoid automatic path addition when inheriting</description>

  <modules>
    <module>../inheritance</module>
  </modules>

  <!-- 5 urls in the pom to configure for not adding path -->
  <url>http://www.apache.org/path/to/parent/</url>
  <scm child.scm.connection.inherit.append.path="false"

To learn more about Python Packages and Modules, read [the official Python documentation about Modules](https://docs.python.org/3/tutorial/modules.html).

///

### Avoid name collisions { #avoid-name-collisions }

We are importing the submodule `items` directly, instead of importing just its variable `router`.

This is because we also have another variable named `router` in the submodule `users`.

            }

            for (String module : parent.getModules()) {
                module = module.replace('\\', '/');

                if (module.regionMatches(true, module.length() - 4, ".xml", 0, 4)) {
                    module = module.substring(0, module.lastIndexOf('/') + 1);
                }

                String moduleName = module;
                if (moduleName.endsWith("/")) {