Title - every treaty has a formal title, but an abbreviated form may be commonly used e.g. European Convention on Human Rights - the original formal title was Convention for the Protection of Human Rights and Fundamental Freedoms.

Date of signature - usually essential to know for tracing purposes.

Place of signature - not always essential, but often used in popular titles, e.g. the Warsaw Convention, the Treaty of Rome, and the Schengen Agreement.

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The component sections of a treaty are usually called articles.  These may be divided further into paragraphs and sub-paragraphs.