Translating Data Between Xml Schema and 6Nf Conceptual Models

Sixth Normal Form (6NF) is a term used in relational database theory by Christopher Date to describe databases which decompose relational variables to irreducible elements. While this form may be unimportant for non-temporal data, it is certainly important for data containing temporal variables of a point-in-time or interval nature. With the advent of Data Warehousing 2.0 (DW 2.0), there is now an increased emphasis on using fully-temporalized databases in the context of data warehousing, in particular with approaches such as the Anchor Model and Data Vault. In this work, we will explore the concepts of temporal data, 6NF conceptual database models, and their relationship with DW 2.0. Further, we will evaluate the Anchor Model and Data Vault as design methods in which to capture temporal data. Using these methods, we will define a process for translating 6NF-compliant data into a standard eXtensible Markup Language (XML) Schema which can be used to describe and present such data to disparate systems in a structured format suitable for data exchange. Further, we will discuss benefits, advantages, and limitations to using XML representations of 6NF models for the transfer of data into a data warehouse

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Controversy exists as to whether neoadjuvant chemotherapy improves survival in patients with invasive bladder cancer, despite randomised controlled trials of more than 3000 patients. We undertook a systematic review and meta-analysis to assess the effect of such treatment on survival in patients with this disease