To save a schema from the Query Designer select the Actions ‣ Save Schema item in the main menu or the Save Schema toolbar button.
When you save a schema for the first time the Save Schema dialog appears where you should input a name and browse for a location of the schema file. The schema is saved to a file with the *.uql extension.
To save a schema to a different file select the Save Schema As item on the toolbar or in the Actions main menu.