All parts have a basic set of properties; these include the part kind, the part category, the view type (icon or frame, as we'll see in a moment), which editor to use, who last modified the contents of the part, and when the part was last modified. You may decide to support additional properties for parts that you develop, for example, whether to keep a paragraph of text with the next paragraph. Some part properties, such as the view type, may be modified by users; other properties may be set only by developers or by the system.
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