An application should contain a complete specification or provisional specification. A conditional specification should describe the nature of the invention. A complete specification should notably describe and ascertain the nature of the invention.
A specification should begin with the title, and in the case of a complete specification description, this should end with a definite statement of the invention. If the applicant doesn’t leave complete specification along with his application, s/he might leave it at any subsequent time within nine months from the date of the application
The Registrar might need that appropriate drawings/model or sample of anything that illustrates the invention which shall be provided and such drawings/models or samples shall be a part of the whole specification.