The following shows the <WBSMasks> element structure for Microsoft Office Project 2003.
<Project>
				   . . .
				   <WBSMasks>
				      <VerifyUniqueCodes/>
				      <GenerateCodes/>
				      <Prefix/>
				      <WBSMask>
				         <Level/>
				         <Type/>
				         <Length/>
				         <Separator/>
				      </WBSMask>
				  </WBSMasks>
				   . . .
</Project>