code: function fromXML($xmlElement)
      {
          $this->author = $xmlElement->author;
          $this->countContacts = $xmlElement->count_contacts;
          $this->countRules = $xmlElement->count_rules;
          $this->created = $xmlElement->created;
          $this->id = $xmlElement->id;
          $this->name = $xmlElement->name;
          $this->state = $xmlElement->state;
          if ($xmlElement->rules) {
              $rules = $xmlElement->rules;
              foreach ($rules as $rule) {
                  array_push($this->rules, new Rule($rule->is_customfield, $rule->field, $rule->operator, $rule->value, $rule->type));
              }
          }
      }
docs: Initializes this contact filter from an XML representation.
  
  @param SimpleXMLElement $xmlElement
  the XML representation to use