To declare a file entity in formal markup, use this syntax:
<!entity entityname SYSTEM "filename">
Where entityname is the name of the entity and filename is the name of the file. The keyword SYSTEM is required.
To use entity declarations previously created for shorthand markup, you must replace the FILE parameter with SYSTEM.
Here are the entity declarations for a help volume that consists of three text files and contains a graphic image.
<!entity MetaInformation SYSTEM "metainfo>" <!entity BasicTasks SYSTEM "basics"> <!entity AdvancedFeatures SYSTEM "advanced"> <!entity process_diagram SYSTEM "process.tif">
Entities are referenced in formal markup exactly as they are in shorthand markup.