class PropertyValue{

    String cid;
    String property;
    String value;

    public static Set<String> properties = new HashSet<>();
    public static Set<String> values = new HashSet<>();

    public PropertyValue(String cid, String property, String value) {
        this.cid = cid;
        this.property = property;
        this.value = value;

        keys.add(property);
        values.add(value);
    }
}