You can update a schema object when elements, attributes, types, or other schema components change. When you update a schema object, the Developer tool updates objects that use the schema.
You can update a schema object through the following methods:
Synchronize the schema.
Synchronize a schema object when you update the schema files outside the Developer tool. When you synchronize a schema object, the Developer tool reimports all of the schema .xsd files that contain changes.
Edit a schema file.
Edit a schema file when you want to update a file from within the Developer tool. When you edit a schema file, the Developer tool opens the file in the editor you use for .xsd files. You can open the file in a different editor or set a default editor for .xsd files in the Developer tool.