simpletype类型的子属性和元素的名称是该表的列的名称。
The names of child attributes and elements of simpleType are the names of the columns of that table.
争议很大的惟一粒子属性（Unique Particle Attribution，UPA）规则不允许使用可选的通配符。
The very controversial Unique Particle Attribution (UPA) rule makes it difficult to use optional wildcards.
其中包括粒子派生(particle derivation)和惟一粒子属性(unique particle attribution)约束。
These include the particle derivation and unique particle attribution constraints.
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