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I supose by "QName(String lname, String namespace = String())" you mean something like class QName{ private String namespaceURI; private String localName; public QName(String ln){ this.localName = ln; namespaceURI = new String(); } } This si indeed a possibility, but in many cases you might need more, like, for instance, to actually pass a namespaceURI to a constructor, or even a prefix. So you can overload the constructor. Like this: class QName{ private String namespaceURI; private String localName; private String prefix; public QName(String ln){ this.localName = ln; namespaceURI = new String(); prefix = new String(); } public QName(String ln, String nu){ this.localName = ln; namespaceURI = nu; prefix = new String(); } public QName(String ln, String nu, String px){ ..... } } This way the experienced users can use what suits them best. You can also take a look at this: http://java.sun.com/j2se/1.5.0/docs/api/javax/xml/namespace/QName.html Chances are you have already a QName class at your disposal and you don't have to design any constructors. Greetings, Radu 2006/11/9, Frans Englich <frans.englich@t...>: On Thursday 09 November 2006 13:32, Richard Salz wrote:
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