* undergone any updates by the model builder, e.g. reflects neither inheritance nor interpolation. The model
     * identifier should be from the collection obtained by {@link #getModelIds()}.
     *
     * @see #getModelIds()
     * @param modelId The identifier of the desired raw model, must not be {@code null}.
     * @return The raw model or {@code null} if the specified model id does not refer to a known model.
     */

     * @return The identifier of the POM or an empty string if not known, never {@code null}.
     */
    public String getModelId() {
        if (result == null || result.getModelIds().isEmpty()) {
            return "";
        }
        return result.getModelIds().get(0);
    }

    /**
     * Gets the problems that caused this exception.
     *
     * @return The problems that caused this exception, never {@code null}.

        this.effectiveModel = result.getEffectiveModel();
        this.fileModel = result.getFileModel();
        this.problems.addAll(result.getProblems());

        for (String modelId : result.getModelIds()) {
            this.modelIds.add(modelId);
            this.rawModels.put(modelId, result.getRawModel(modelId));
            this.activePomProfiles.put(modelId, result.getActivePomProfiles(modelId));
        }
    }

                req.getException());

        add(problem);
    }

    public ModelBuildingException newModelBuildingException() {
        ModelBuildingResult result = this.result;
        if (result.getModelIds().isEmpty()) {
            DefaultModelBuildingResult tmp = new DefaultModelBuildingResult();
            tmp.setEffectiveModel(result.getEffectiveModel());
            tmp.setProblems(getProblems());