Programmer's Guide > Interfaces > W3C Node interface > lookupNamespaceURI method
  
lookupNamespaceURI method
Look up the namespace URI associated to the given prefix, starting from this node.
lookupNamespaceURI(prefix )
Parameters
Stringprefix
The prefix to look for. If this parameter is null, the method will return the default namespace URI if any.
Returns
String. Returns the associated namespace URI or null if none is found.