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Version: 0.2  2017.11.28 AET

"EEX" is acronym for EDM EXPRESS Extension Schema, and is also the file extension used for such files.

Using EXPRESS_EXTENSION_SCHEMA  from QUERY SCHEMA

To enable compile-time checking and binding an EDM query schema must specify which extension schemata it depends on by specifying the extension as follows in the GLOBAL section:

...

QUERY_SCHEMA MyQueries FOR IFC4;
GLOBAL
GLOBAL
   DECLARE trg  INSTANCE OF IFC4;
   DECLARE ex1  INSTANCE OF EXPRESS_EXTENSION_SCHEMA EEX_1001; -- implicit: FOR IFC4;

END_GLOBAL;



	-- ... addition declarations ...
END_GLOBAL;
 
-- ... normal query schema syntax ...ENTITY xifcWindShield SUBTYPE of IfcWindow;		
 
END_QUERY:_SCHEMA;   

The "schema_instance" declaration name "ex1" has no use further in the query schema. Constructs from the specified extension will be imported into compiler enabling named access from the query scschema code.