public boolean isUniqueVersion() {
        return true;
    }

    public List<ArtifactRepository> getMirroredRepositories() {
        return mirroredRepositories;
    }

    public void setMirroredRepositories(List<ArtifactRepository> mirroredRepositories) {
        if (mirroredRepositories != null) {
            this.mirroredRepositories = Collections.unmodifiableList(mirroredRepositories);
        } else {