Section 2(1)(b) in The Digital Signature (End entity) Rules, 2015
(b)"canonicalisation", in relation to a xml digital signature, means the process of converting electronic record that has more than one possible representation into a 'standard', 'normal', or 'canonical form' in which the variations in representation of electronic record shall be standardised by applying consistent rules, primarily as part of the xml digital signature creation and verification processes;