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Each host's Host Controller is responsible for launching the servers configured in its host.xml file. To do this the Host Controller gets a copy of the domain-wide configuration from the Domain Controller, extracts the portion of the domain-wide configuration that is relevant to the server (e.g. the details of the profile the server is configured to run), applies host-specific information (e.g. the IP addresses to use for named interfaces), and creates a server-specific configuration. The Host Controller then launches the server process and provides it its configuration. If that server-specific configuration were represented in XML form, it would look the same as a standalone.xml file -- the Host Controller essentially synthesizes a standalone.xml from the relevant domain.xml and host.xml content.