XML Integration into an SQL-based CEP Engine

In order to address the lack of XML support in Complex Event Processing (CEP) systems, we propose an approach for XML integration into a CEP engine we call EQL/XA (XML-aware event query language). As event query languages are generally SQL-based, our approach is based on the independent part of the SQL standard - XML-related Specifications (SQL/XML). EQL/XA consists of several concepts that together offer significant XML support. We introduce a data type for representing XML, an XQuery function that is able to query and construct XML data, an aggregate function that concatenates a group of XML values into a single value and last but not least, we have proposed two stream-to-stream operators that together are capable of flattening XML events into events containing only atomic EQL data types. Thus, we have significantly enhanced the expressiveness of pure EQL.

Autorentext

Martin Prodanov is a Software Engineer specialized in Complex Event Processing and In-Memory processing of streaming and pull data. After graduating from the Technical University of Darmstadt in 2011 as a M.Sc. in Computer Science, Martin is working for Software AG in the department for Intelligent Business Operations and Big Data.