static ModelSource fromPath(@Nonnull Path path) {
        return fromPath(path, null);
    }

    @Nonnull
    static ModelSource fromPath(@Nonnull Path path, @Nullable String location) {
        return new PathSource(nonNull(path, "path cannot be null"), location);
    }

    @Nullable
    Source resolve(@Nonnull String relative);

    /**
     * Creates a Source for the following Path
     */
    @Nonnull
    static Source fromPath(@Nonnull Path path) {
        return new PathSource(nonNull(path, "path cannot be null"));
    }