The Microsoft XML Viewer comes in to the picture when you view an xml file in Internet Explorer or by using MS Word. When an xml document is viewed in the Internet Explorer, the document is not validated against a DTD or a Schema.

When you are navigating the Internet Explorer browser directly to an XML file, the XML viewer does not validate the document against its Document Type Definition (DTD) or Schema.

It is assumed that when you request to see the XML document in the browser, you merely want to see the XML data as is rendered against a stylesheet. This requires that the XML content be parsed, but validation against the schema or DTD is unnecessary.

The Microsoft© Office 2003 XML viewer supports the display of the following XML files inside Internet Explorer:

" Wordprocessing Markup Language (WordProcessingML) files, which are Microsoft Office Word 2003 files saved as XML files. They are identified by the Office Word 2003 processing instruction (PI):

<?mso-application progid="Word.Document"?>

" Other XML files that contain the msoxml PI:
<?mso-application progid="Msoxml.Document"?>

Once you opened an XML file with one of the above PIs in Internet Explorer, you can add views (XSLT transformations) that affect how your file displays. You can also delete, modify, and switch between views.

Note Throughout this topic, instructions to open an XML file assume the file contains one of the two PIs listed above.

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