Sybase PowerDesigner XML User Manual page 218

Generating an XSD, a DTD or an XDR file
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2 Type a destination directory for the generated file in the Directory box.
or
Click the Select a Path button beside the Directory box and browse to
select a directory path.
In the case of an XDR file, the Generation dialog box displays an
Options page where the generation of comments (see Comment property
in the General page of an object property sheet) is set by default. If you
do not want a commentary to appear in the generated XDR file (within a
<description> tag), you can set the Value to false.
3 <optional> Select the Check model check box if you want to verify the
validity of your model before generation.
4 Click OK.
PowerDesigner