get_namespace( node, prefix )
  private
  
    
    
Returns a String namespace for a node, given a
prefix The rules are:
- 
Use the supplied namespace mapping first.
 - 
If no mapping was supplied, use the context node to look up the namespace
 
   
  
    Show source    
    
      
    def get_namespace( node, prefix )
      if @namespaces
        return @namespaces[prefix] || ''
      else
        return node.namespace( prefix ) if node.node_type == :element
        return ''
      end
    end