.XDL File Extension
File Type 1Oracle Expert Definition Language File
What is an XDL file?
Defines the classes and structures of other files created by the Oracle Expert database optimization program; created whenever a database, environment, instance, schema, or workload data is exported by Oracle Expert.
File Type 2XML Schema File
.XDL File Association 2
Defines the structure and format of an XML document; used by various programs that store information in the XML format.