private final DoNothingCompatibilityRule compatibilityRule = new DoNothingCompatibilityRule();
    private final DoNothingDisambiguationRule disambiguationRule = new DoNothingDisambiguationRule();

    protected EmptySchema() {
    }

    @Override
    public CompatibilityRule<Object> compatibilityRules(Attribute<?> attribute) {
        return compatibilityRule;
    }

    @Override

    /**
     * Returns a matcher that uses the rules from this schema, and assumes the producer has the same rules.
     */
    AttributeMatcher matcher();

    CompatibilityRule<Object> compatibilityRules(Attribute<?> attribute);

    DisambiguationRule<Object> disambiguationRules(Attribute<?> attribute);

    @Nullable
    Attribute<?> getAttributeByName(String name);

    /**