简单内容（Simple Content）的衍生型态是使用 xs:simpleContent 元素，配合 xs:extension 和 xs:restriction 元素扩充与限制父型态，以建新的复杂型态。
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Create Simple Content 创建简单内容
Simple content type cannot define any order set.
简单内容类型无法定义任何顺序集。
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Some topic types provide very simple content structures.
有些主题提供非常简单的内容结构。
When defining a complex type with simple content, you can specify two types of assertions.
在使用简单内容定义复杂类型时，可以指定两种类型的断言。
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The audio streams are divided into simple content categories.
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Apparently this is an actual transfer of data rather than simple caching of content.
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