document: An event-condition-action language for XML XML repositories are now a widespread means for storing and exchanging information on the Web . As these repositories become increasingly used in dynamic applications such as e-commerce , there is a rapidly growing need for a mechanism to incorporate reactive functionality in an XML setting . Event-condition-action ( ECA ) rules are a technology from active databases and are a natural method for supporting suchfunctionality . ECA rules can be used for activities such as automatically enforcing document constraints , maintaining repository statistics , and facilitating publish\/subscribe applications . An important question associated with the use of a ECA rules is how to statically predict their run-time behavior . In this paper , we define a language for ECA rules on XML repositories . We then investigate methods for analyzing the behavior of a set of ECA rules , a task which has added complexity in this XML setting compared with conventional active databases .
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