asmx wsdl string length

public class foo
 public bla as String
end class

<s:complexType name="foo">
  <s:sequence>
    <s:element minOccurs="0" maxOccurs="1" name="bla" type="s:string" />
  </s:sequence>
</s:complexType>

<xs:element name="bla" type="xs:string"
    sql:datatype="varchar(25)" minOccurs="1" maxOccurs="1">
</xs:element>

<XmlElement(DataType := "varchar(25)")>