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For this example (running a physics program), we could use a specific machine as defined on previous foil (the Windows NT PC maryland) or a generic machine <run domain="any" machine="any" type="pc" os="nt" >
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In this case, middle tier broker, would look in a database (XML file) to find what machines were available and either automatically or with user input choose one.
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Both Software and Hardware are defined in XML
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Note databases and an XML files are logically equivalent
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JDBC can access either Oracle (Microsoft) database or XML ASCII file
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More generally XML can be thought of as general object serialization
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A database table is one type of object
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