EXTENSION OF PARSABLE STRUCTURES

A bilateral interface may comprise an object interface and, optionally, a language interface. The object interface comprises at least an object-side object interface to be included in an external object, and a structure-side object interface to be included in a parsable structure. When executed, an object initialization routine included in the object-side object interface provides an identification of the structure-side object interface to the external object. Conversely, a structure initialization routine included in the structure-side object interface provides an identification of at least one object interaction routine to the external object. The external object can then invoke the at least one object interaction routine to interact with the parsable structure. The language interface is similarly constructed. The bilateral interface of the present invention provides much greater extensibility for parsable structures than was previously possible and provides, for example, for the addition of customized keywords.