(classifier, extension, language) and how to manage it as dependency (add to classpath, include dependencies).

  They are replaced in Maven 4 with Maven 4 API Core's {{{../api/maven-api-core/apidocs/org/apache/maven/api/Type.html}Dependency Types}},

/**
 * <strong>NOTE:</strong> This class is not part of any public api and can be changed or deleted without prior notice.
 * This class in particular may spontaneously self-combust and be replaced by a plexus-compliant thread aware
 * logger implementation at any time.
 *
 * @since 3.0
 */
@SuppressWarnings({"SynchronizationOnLocalVariableOrMethodParameter"})
public class ThreadOutputMuxer {

          <version>4.0.0+</version>
          <description>
            <![CDATA[
            FOR SYSTEM SCOPE ONLY. Note that use of this property is <b>discouraged</b>
            and may be replaced in later versions. This specifies the path on the filesystem
            for this dependency.
            Requires an absolute path for the value, not relative.

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