In this paper we propose the usage of W3C-standardized query language, XQuery, to accommodate XML Update. Our main aim is
to enable the update without violating the semantic constraint of the documents. The focus of the update is on the association
relationship. Therefore, we distinguish the relationship type based on the number of participants, cardinality, and adhesion.
We also propose the mapping of the association relationship in the conceptual level to the XML Schema. We use XML Schema for
structure validation, even though the algorithm can be used by any schema languages.