}

        // beware meta-versions!
        String version = metadata.getVersion();
        if (Artifact.LATEST_VERSION.equals(version) || Artifact.RELEASE_VERSION.equals(version)) {
            // meta-versions are not valid <version/> values...don't write them.
            metadata.setVersion(null);
        }

        if (changed || !metadataFile.exists()) {

     */
    public String getVersion() {
        return (version != null) ? version : "";
    }

    /**
     * Sets the effective version of the model.
     *
     * @param version The effective version of the model, may be {@code null}.
     */
    public void setVersion(String version) {
        this.version = version;
    }

    /**

                                parent.getVersion()),
                        parent.getGroupId(),
                        parent.getArtifactId(),
                        parent.getVersion());
            }

            parent.setVersion(versionRangeResult.getHighestVersion().toString());

            return resolveModel(parent.getGroupId(), parent.getArtifactId(), parent.getVersion());

        pd.setArtifactId("my-plugin");
        pd.setGroupId("org.myco.plugins");
        pd.setVersion("1");

        DefaultArtifact artifact = new DefaultArtifact(
                pd.getGroupId(),
                pd.getArtifactId(),
                pd.getVersion(),
                "compile",
                "maven-plugin",
                "",

                                    .setVersion(lowerBound.getVersion().toString())
                            : null;
                    org.eclipse.aether.artifact.Artifact upperArtifact = upperBound != null
                            ? request.getArtifact()
                                    .setVersion(upperBound.getVersion().toString())
                            : null;

        }

        public void setArtifactId(String artifactId) {
            this.artifactId = artifactId;
        }

        public String getVersion() {
            return version;
        }

        public void setVersion(String version) {
            this.version = version;
        }

        public String getExtension() {
            return extension;
        }

    public PluginDescriptor() {}

    public PluginDescriptor(PluginDescriptor original) {
        this.setGroupId(original.getGroupId());
        this.setArtifactId(original.getArtifactId());
        this.setVersion(original.getVersion());
        this.setGoalPrefix(original.getGoalPrefix());
        this.setInheritedByDefault(original.isInheritedByDefault());
        this.setName(original.getName());

        // does nothing
    }

    DefaultPluginVersionResult(String version) {
        this.version = version;
    }

    @Override
    public String getVersion() {
        return version;
    }

    public void setVersion(String version) {
        this.version = version;
    }

    @Override
    public ArtifactRepository getRepository() {
        return repository;
    }

        CoreExtension oldExtension = new CoreExtension();
        oldExtension.setGroupId(extension.getGroupId());
        oldExtension.setArtifactId(extension.getArtifactId());
        oldExtension.setVersion(extension.getVersion());
        if (extension.getClassLoadingStrategy() != null) {
            oldExtension.setClassLoadingStrategy(extension.getClassLoadingStrategy());
        }
        this.extension = oldExtension;
    }

        return artifact.getArtifactId();
    }

    /** {@inheritDoc} */
    @Override
    public String getVersion() {
        return artifact.getVersion();
    }

    /** {@inheritDoc} */
    @Override
    public void setVersion(String version) {
        artifact.setVersion(version);
    }

    /** {@inheritDoc} */
    @Override
    public String getScope() {
        return artifact.getScope();