通配府“<var>X</var>”允许使用元素“<var>Y</var>”，导致内容模型变得不明确。必须形成内容模型，这样，在验证元素信息项序列时，其中直接、间接或隐式包含的、依次试图用来验证序列中每项的粒子就可以唯一确定，而不必检查该项的内容或属性，而且无需序列中其余项的任何信息。

Wildcard '<var>X</var>' allows element '<var>Y</var>', and 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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