What is config.xml?

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config.xml is the central configuration repository for a domain. every resource you have configured from admin console or by command line or by any other tool registered under this file. WLS 9.x onwards, this file contain references to other XML configuration files also those are under your domain/config folder ( further subfolder under it for respective resources ) since wls 9.x onwards concept of modules are introduced for sub-resources like data source, JMS etc otherwise prior to 9.x ( 8.x or older ) every configuration was stored under this single config.xml file

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