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A GINO Pipeline is defined in an XML file whose format is described by a W3C XML Schema available at http://glast-ground.slac.stanford.edu/pipeline/pipeline.xsd. This schema will mainly be useful if you use an XML editor that supports W3C XML Schema, which these days includes nearly all modern XML editors. XML Spy is a good choice that we have experience with. However, most pipelines will be easy to configure with a simple text editor (emacs for example).
Here are the steps you should take to create a configuration file to define a pipeline. The order is important.
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