return model;
    }

    /**
     * Gets the effective group identifier of the model.
     *
     * @return The effective group identifier of the model or an empty string if unknown, never {@code null}.
     */
    public String getGroupId() {
        return (groupId != null) ? groupId : "";
    }

    /**
     * Gets the effective artifact identifier of the model.
     *

    }

    /**
     * Mark a profile as required and activated.
     * @param id The identifier of the profile.
     */
    public void activateRequiredProfile(String id) {
        this.activations.put(id, ActivationSettings.ACTIVATION_REQUIRED);
    }

    /**
     * Mark a profile as optional and activated.
     * @param id The identifier of the profile.
     */
    public void activateOptionalProfile(String id) {

    /**
     * Gets the sequence of model identifiers that denote the lineage of models from which the effective model was
     * constructed. Model identifiers should be handled as "opaque strings" and this method should be used as source
     * if navigating the linage. The first identifier from the list denotes the model on which the model builder
     * was originally invoked. The last identifier will always be the super POM.
     *

    }

    /**
     * Gets the identifier of the POM whose effective model could not be built. The general format of the identifier is
     * {@code <groupId>:<artifactId>:<version>} but some of these coordinates may still be unknown at the point the
     * exception is thrown so this information is merely meant to assist the user.
     *
     * @return The identifier of the POM or an empty string if not known, never {@code null}.

    // --------------------------/
    // - Class/Member Variables -/
    // --------------------------/

    /**
     *
     *
     *             The identifier of the POM in the format {@code
     * <groupId>:<artifactId>:<version>}.
     *
     *
     */
    private String modelId;

    /**
     *
     *

     */
    int getColumnNumber();

    /**
     * Gets the identifier of the model from which the problem originated. While the general form of this identifier is
     * <code>groupId:artifactId:version</code> the returned identifier need not be complete. The identifier is derived
     * from the information that is available at the point the problem occurs and as such merely serves as a best effort

    /**
     * Shortcut for {@code getService(ArtifactFactory.class).create(...)}.
     *
     * @param groupId the group identifier, or {@code null} is unspecified
     * @param artifactId the artifact identifier, or {@code null} is unspecified
     * @param version the artifact version, or {@code null} is unspecified
     * @param extension the artifact extension, or {@code null} is unspecified

    private boolean blocked;

    /**
     * Create a local repository or a test repository.
     *
     * @param id     the unique identifier of the repository
     * @param url    the URL of the repository
     * @param layout the layout of the repository
     */
    public DefaultArtifactRepository(String id, String url, ArtifactRepositoryLayout layout) {

     *
     * @param lifecycleId The identifier of the lifecycle that could not be located, may be {@code null}.
     */
    public LifecycleNotFoundException(String lifecycleId) {
        super("Unknown lifecycle " + lifecycleId);
        this.lifecycleId = (lifecycleId != null) ? lifecycleId : "";
    }

    /**
     * Gets the identifier of the lifecycle that was not found.
     *

@Deprecated(since = "4.0.0")
public interface ModelResolver {

    /**
     * Tries to resolve the POM for the specified coordinates.
     *
     * @param groupId The group identifier of the POM, must not be {@code null}.
     * @param artifactId The artifact identifier of the POM, must not be {@code null}.
     * @param version The version of the POM, must not be {@code null}.
     * @return The source of the requested POM, never {@code null}.