Parsing XML in PL/SQL

 Hi All, I'm new to PL/SQL. I need to call a web service from within the PL/SQL and then need to parse the response XML. I was able to call the web service and now I have returned SOAP response XML in CLOB. I searched on google for way to parse this XML and create some kind of list or array or collection with all the values so that later on that collection or array can be used in displaying the data or storing the data, but I couldn't found the right information, rather I got very confused.