컨텐트 모델은 명확해야 합니다. '<var>X</var>' 요소를 여러 번 정의하면 컨텐트 모델이 모호해집니다.

Multiple definition of element '<var>X</var>' causes the content model to become ambiguous. A content model must be formed such that during validation of an element information item sequence, the particle contained directly, indirectly or implicitly therein with which to attempt to validate each item in the sequence in turn can be uniquely determined without examining the content or attributes of that item, and without any information about the items in the remainder of the sequence.

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