Caché Class Definition Reference
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Specifies whether instance methods in this class can use the now-obsolete %this variable.
To enable instance methods in the class to use %this, use the following syntax:
Class MyApp.MyClass [ LegacyInstanceContext ]  { //class members }
Otherwise, omit this keyword or place the word Not immediately before the keyword.
If this keyword is true, instance methods in this class can use the %this variable, which is now obsolete (replaced by $this). If this keyword is false, instance methods cannot refer to %this.
Effect on Subclasses
This keyword is not inherited.
If you omit this keyword, instance methods cannot refer to %this.
Upon upgrade, existing classes are automatically marked with [ LegacyInstanceContext ], to preserve backward compatibility; see the chapter Caché 2011.1 in the Caché Release Notes and Upgrade Checklist Archive.
See Also

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