请修缮这段文字要求表达要清晰语法要准确。Referring to Searles classification framework of speech act theory and Austins speech act theory the author classifies the content of public service announcement language according

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In this paper, the author applies Searle's classification framework of speech act theory and Austin's speech act theory to categorize the content of public service announcement language. The aim is to analyze the types of public service announcement language in pragmatics. The author identifies four categories of public service announcement language, namely exposition, instruction, commitment, and expression.