As of March 14, 2008, the XQuery Update Facility specification has become a "Candidate Recommendation", which means it is now pretty stable. The answer seems obvious, yet after all the XQuery language itself - or its cousin XSLT2 - is powerful enough to write any transformation of an XML tree.
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So as we will see the little complexity added by XQuery Update seems quite worth the effort.
This tutorial attempts to give a quick yet comprehensive practical introduction to the XQuery Update extension, while highlighting some of its peculiarities.
An error is generated (during the apply-updates stage) when such a conflict is detected.
A bit ironically, no error is generated for meaningless but non ambiguous conflicts, for example both renaming and deleting the same node (The XQuery Update Facility is a powerful, convenient and elegant extension of the XQuery language, in spite of a few peculiarities that can be slightly off-putting for programmers.
See Reading, Combining, and Modifying SAS Data Sets in replace existing values in the master data set.
Therefore, if you want to update some but not all variables and if the variables you want to update differ from one observation to the next, set to missing those variables that are not changing.
Prerequisites: the reader is presumed to have some acquaintance with XML Query and its (or contents) of the same node.
The XQUF specifications take care of forbidding such ambiguous updates.
The WHERE clause specifies which record(s) that should be updated.