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Elements: testing the status of proper and included elements
Prerequisite Concepts		Related Syntax

There are three ways to classify elements based on why they are permitted at a given point in the document.

1. The document element is the outermost element of the document instance. It is specified in the DTD.
2. A proper subelement is one which is permitted at the current point by a content model group in the declaration of the parent element.
3. An included subelement is one which is permitted by an inclusion exception in an open element.

OmniMark provides the status test to determine why an element was allowed.