Re: Demo: Modelling Cost of Travel Paths Between Towns

> What does the DDL look like? e.g. "aspirin is a thing",
> "tylenol is a thing", "Nyquil is a thing" etc. some are "cold medecines",
> which are a sub-class of medicines, but some could be
> used as simply a "headache remedy."
> Thus they belong to two hierarchies.

// Create classes to categorize things

CREATE *medicine.cls = thing;
CREATE *headache remedy.cls = thing;
CREATE *cold medicine.cls = thing;

// Assuming asprin is a medicine and headache remedy CREATE *asprin.cls = medicine;
CREATE asprin.cls = headache remedy;

// Assuming tylenol is a medicine and cold medicine CREATE *tylenol.cls = medicine;
CREATE tylenol.cls = cold medicine;

// Assuming nyquil is a medicine, headache remedy and cold medicine CREATE *nyquil.cls = medicine;
CREATE nyquil.cls = headache remedy;
CREATE nyquil.cls = cold medicine;

// Assuming garlic is a headache remedy and cold medicine // but not a medicine
CREATE *garlic.cls = headache remedy;
CREATE garlic.cls = cold medicine;

// Assuming ginger is a cold medicine only CREATE *ginger.cls = cold medicine;

Please show RM's equivalent without NULLs and redundant data. Received on Fri Dec 03 2004 - 10:44:35 CST