weird xml tag

Hi All, I am writing module to display recent Wordpress blog posts in drupal. I am taking RSS feeds of blog. I am using simple xml library of PHP to parse xml. Now the problem is I get weird tag in XML. <dc:creator>Jason Bourne</dc:creator> when i convert this xml into object by using simplexml_load_string I am not getting dc:creator in the object as dc:creator is not valid variable name. can someone tell me how to access it? appreciate your help -- Devendra Jadhav देवेंद्र जाधव