  Integrating open data sources can yield high value information but raises
major problems in terms of metadata extraction, data source integration and
visualization of integrated data. In this paper, we describe WebSmatch, a
flexible environment for Web data integration, based on a real, end-to-end data
integration scenario over public data from Data Publica. WebSmatch supports the
full process of importing, refining and integrating data sources and uses third
party tools for high quality visualization. We use a typical scenario of public
data integration which involves problems not solved by currents tools: poorly
structured input data sources (XLS files) and rich visualization of integrated
data.
