In the Schema tab, you can specify a schema that Oxygen XML Editor uses if an XML document does not contain a schema declaration and no default validation
scenario is associated with it.
To set the Schema URL, use editor variables to specify the path to
the Schema file.
Note: It is a good practice to store all resources in the framework directory and use the
${framework} editor variable to reference them. This is a recommended
approach to designing a self-contained document type that can be easily maintained and shared
between different users.