The most distinguishing feature of common law is the reliance on the doctrine of precedent when making court judgments. It is not restricted to judicial decisions generated within Hong Kong but case law from all jurisdictions throughout the common law world. Article 84 of the Basic Law provides that the Hong Kong courts may refer to case precedents from other countries under common law jurisdictions. 

What is the meaning of the 'Doctrine of Precedent' under the Common Law practice?