SEKE 2012 Proceedings - Knowledge Systems Institute

• Representation conflicts: occurs when an element has
its content represented in a different format required
for the storage into the DB. More specifically, the information
available in XML is not compatible with
the corresponding data type in the relational model.
For example, a date format represented in the RDB as
yyyy-mm-dd and represented in the XML document as
dd/mm/yyyy.
6 Experiments
The XMap component was implemented as an extension
of the X2Rel framework. We used Java as the programming
language (version 1.6.0_25) and Castor library for mapping
file interpretation. We have performed two group of experiments.
The XML files of the experiments are found at [2].
This repository also stores the global ontologies created by
OntoGen, the relational schemas created by OntoRel and
the mapping documents (input artifacts for the XMap tool).
The second group of experiments used the files described
in Figure 4, also available at [2]. By running the component,
the tables presented in Section 4.1 were populated with the
extracted data from the original XML files.
7 Final Remarks
This paper focuses on XMap development, a framework
component responsible for mapping and storing XML data
into a RDB. To perform this storage, a series of conflicts are
solved. The solution is based on a mapping document, an
useful artifact to express the equivalences between XML,
ontology and the corresponding relational concepts (table
and column). This document facilitates the mapping during
data transformations and also the XML data retrieval
through the use of XPath expressions.
So far we assume that the data synchronization process
handles automatically once the XML data are mapped and
stored into the RDB. This mechanism, known as view maintenance,
is deeply explored in [4]. As a future work, we will
address complementary issues, such as element order and
duplicata elimination.
8 Acknowledgments
This work has been partly supported by SESU/MEC
(PET-Programa de Educação Tutorial) and FAPERGS
(Auxílio Recém Doutor - Process no. 11/0748-6).
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