When you create an XSLT service, Designer creates its associated style sheet. The style sheet is empty by default. You can type in XSLT code and build the style sheet from scratch, or you can import an existing style sheet as a basis for the new document. You use the Source tab in the XSLT style sheet editor in Designer to add or edit the contents of a style sheet. The style sheet editor includes standard editing functions, as well as features for supporting the XSLT programming language, such as highlighting certain elements in color.

The XSLT style sheet contains XSLT template rules and instructions for transforming XML data provided as input to the XSLT service. You can enter and modify the code in the service’s style sheet using the XSLT service editor in Designer.

Designer provides the full capabilities of the Eclipse XSLT editor, for example, source formatting, code completion, undo and redo, find and replace etc.

You can also use the Comments tab to specify comments or notes, if any, for the XSLT service

You can use the Window > Preferences > XML > XSL page to customize the XSLT service editor. You can also access the preferences page by right-clicking inside the XSLT editor and selecting Preferences.