Ángel Viña

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The world today is characterised by the proliferation of information sources available through media such as the WWW, databases, semi-structured files (e.g. XML documents), etc. Nevertheless, this information is usually scattered, heterogeneous and weakly structured, so it is difficult to process it automatically. DENODO Corporation has developed a mediator(More)
A surgical intensive care unit (ICU) is a challenging monitoring environment. The multitude of monitored variables, the high frequency of alarms, and the severity of likely complications and emergencies can overload the cognitive skills of even experienced clinicians. ICU monitoring is also complicated by changes in clinical context. Over the course of a(More)
Semi-automatic wrapper generation tools aim to ease the task of building structured views over semi-structured web sources. But the wrapper generation techniques presented up to date are unable to properly deal with sources requiring complex navigational sequences for accessing data. In this paper, we present Wargo, a semi-automatic wrapper generation tool,(More)
Semi-automatic wrapper generation tools aim to ease the task of building structured views over web sources. But the wrapper generation techniques presented up to date show several weaknesses when dealing with the complex commercial web sources of today, specially when constructing advanced navigational sequences for accessing data. We present Wargo, a(More)
Access to different and remote sources with heterogeneous formats is one of the most important challenges in Enterprise Information Integration. Even though there exists an increasing number of solutions which obtain information from structured and semistructured sources such as web sites, lack of Quality of Service in HTTP connections makes it very(More)
During the last years, significant attention has been paid to the problem of building wrappers for extracting data from semistructured web sources. Nevertheless, since web sources are autonomous, they may experience changes that invalidate the wrappers. In this paper, we present new heuristics and algorithms to address the problem of automatic wrapper(More)