The standalone and Office 2003 Professional versions of Microsoft Office Word 2003 include additional XML functionality not available in Office 2003 Standard. Specifically, they provide support for custom XML schemas. By providing your own XSD schema, you can create solutions that enable end users to edit custom XML from within Word. While Word's custom XML functionality does not provide as much power as a traditional XML editor, it does give you some helpful building blocks for custom Word-based XML editing applications. Ultimately, if you want to build anything but the simplest XML editing solutions, you will also need to utilize the Document Actions task pane through the use of Smart Document technology, as introduced in Chapter 5.