A preamble is an introductory and expressionary statement in a document that explains the document's purpose and underlying philosophy. When applied to the opening paragraphs of a statute, it may recite historical facts pertinent to the subject of the statute. It is distinct from the long title or enacting formula of a law.
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In parliamentary procedure using Robert's Rules of Order, a preamble consists of "Whereas" clauses that are placed before the resolving clauses in a resolution (formal written motion). However, preambles are not required to be placed in resolutions. According to Robert's Rules of Order, including such background information may not be helpful in passing the resolution.