Experiment description or xar (eXperimental ARchive ) files contain XML files that describe an experiment as a series of steps performed on specific inputs, producing specific outputs. Objects in a xar.xml are identified by Life Science Indentifiers (LSIDs).

The topics in this section explain the xar.xml structure and walk through several specific examples. After working through these examples, readers should be able to begin authoring xar.xml files to describe their own experiments. You can author new xar files in an XML editor.


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