The value of the test attribute of the xs:assert element information item is an XPath expression that evaluates to either true or false.
assert 元素信息项的 test 属性的值是一个 XPath 表达式，其值等于 true 或 false。
As a major element of GIS spatial information, multi-media information has been playing an important role in the information expression for large storage volume and shown visually.
作为GIS空间信息的重要组成元素之一，多媒体信息由于存储信息量大，表现直观，在信息表达上发挥着重要作用。
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