Defines the structure types in Model system.

## Package Specification

In ROM, some properties are composed of multiple values. For example, an Action (hyperlink) property has a URL, a target window name, and more. A property structure allows a single property to provide a set of related values. A property structure is just like a structure in C or C++, and is similar to an object in Java or JavaScript. Structures have no members, they just have a set of properties.

Structures also have a name. ROM uses the structure name be to determine the properties that make up the structure. Some structure names are ˇ°Actionˇ±,ˇ°CustomColorˇ±, etc.

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