*/
    ModelSource3 getRelatedSource(ModelLocator locator, String relPath);

    /**
     * When using a ModelSource3, the method with a {@code ModelLocator} argument should
     * be used instead.
     *
     * @deprecated use {@link #getRelatedSource(ModelLocator, String)} instead
     */
    @Deprecated
    default ModelSource3 getRelatedSource(String relPath) {

     *
     * @deprecated instead use {@link #getFile()}
     */
    @Deprecated
    public File getPomFile() {
        return getFile();
    }

    @Override
    public ModelSource3 getRelatedSource(ModelLocator locator, String relPath) {
        relPath = relPath.replace('\\', File.separatorChar).replace('/', File.separatorChar);

        Path path = getPath().getParent().resolve(relPath);

     *
     * @param relPath is the path of the requested model source relative to this model source POM.
     * @return related model source or <code>null</code> if no such model source.
     */
    ModelSource2 getRelatedSource(String relPath);

    /**
     * Returns location of the POM, never <code>null</code>.
     */
    URI getLocationURI();

        }

        @Override
        public String getLocation() {
            return source.getLocation();
        }

        @Override
        public ModelSource2 getRelatedSource(String relPath) {
            Source rel = source.resolve(relPath);
            return rel != null ? new SourceWrapper(rel) : null;
        }

        @Override
        public URI getLocationURI() {

            return null;
        }

        if (source instanceof ModelSource3) {
            return ((ModelSource3) source).getRelatedSource(modelProcessor, parentPath);
        } else {
            return ((ModelSource2) source).getRelatedSource(parentPath);
        }
    }

    private ModelData readParentExternally(