1- Visual XML Schema Editor To open an existing schema, in Applications Navigator look under XML Schema, highlight the schema name and click add to icon, then locate the schema with the xsd (XML Schema Definition) extension. There are many ways to control the Visual Editor such as the Grab Scroll creates a hand for easy maneuvering of the diagram. 2- Xml Schema Registration and the XML Editor In order for you to use a new schema, JDeveloper requires that the schema be registered. This can be done from the Preferences panel. Associate the schema with a xml extension for the future instance documents. Create an xml document matching the definition of the schema that was registered. When the empty document is created, the Structure Pane will display any errors