20 Modeling Feed Data Amodel is a way (Web site translator)
20 Modeling Feed Data Amodel is a way of looking at information a couple of steps removed from the details of specific pieces of data. The aim of creating a model is to enable you to organize data in a logical fashion. Once you have a model for your data and you have a means of managing the data consistently, everything should slot into place. Your software will somehow reflect the shape of the model, which in turn reflects the kind of material that your application is designed to handle. The model itself may just be specified in regular human language what s found in most specifications. Alternatively the model can have a formal definition that enables it to be used alongside information expressed in other data languages. Certain modeling techniques can be used to automatically generate pieces of code for processing the data or storing it in a database. The specifications for Atom, RSS 1.0, and RSS 2.0 all imply models of one form or another into which the data fits. By acknowledging this and addressing the model up front, your software is likely to benefit from architectural consistency and there are less likely to be unwanted surprises further down the road. This chapter uses a loose definition of model that also refers to the syntax and grammar, and describes the following: . A conceptual model of a feed and its entries . What that model looks like in XML . How to model feeds in object-oriented languages . How to map the model to a relational database . What the model looks like in RDF Model or Syntax? What the model actually addresses is a whole other story. It may be a high-level object view, perhaps suitable for direct translation into a programming language. At another level it may be an abstraction of the meaning of the data in terms of formal logic. Another viewpoint that could also be (loosely) described as a model is how strings should be structured within a message, in other words the syntax and grammar.
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