In a computing device that receives handwritten data, a method and data structure that enables extended data to be added to an existing ink word data structure without compromising backwards-compatibility. A flag in the header data structure is indicates to new ink processing programs the presence or...http://www.google.ca/patents/US6771817?utm_source=gb-gplus-sharePatent US6771817 - Method and system for extending ink word data structures while maintaining version compatibility
