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The cityEHR is an example of an open source EHR system which stores clinical data as collections of XML documents. The records gathered in routine clinical care are a rich source of longitudinal data for use in clinical studies. We describe how the standard language XQuery can be used to identify cohorts of patients, matching specified criteria. We...
The popularity of multi-core systems makes software parallelization become an important way to improve performance. As a mainstream XML query language, XQuery is the core of XML processing. It is critical to take full advantage of multi-core computing to improve XML processing performance through parallelization of XQuery. However, usually it is di...
Existing systems or architectures does not almost provide a way to localize sub-parts of multimedia objects (e.g. sub regions of images, persons, events...), which represents semantics of resources. In this paper, we describe semantic relationships between resources, how to represent and create them via contextual schema. In our main system, we use...
As storage-main memory as well as disk-becomes cheaper, the amount of available information is increasing and it is a challenge to organize it. Our broader aim is to provide a unified framework for efficiently versioning and querying data, documents, as well as any kind of semi-structured information between data and documents, which can be stored...