毫无疑问，新的标准是向上兼容的。
It almost goes without saying that the new Standard is upwardly compatible with the old.
当 XML 数据更新为与现有 XML schema 具有向上兼容性时，可以使用新的 XML schema 来管理现有 XML 数据，无需任何修改。
When XML data is evolved which is upward compatible with the existing XML schema, you can manage the existing XML data with the new XML schema without any modification.
这个场景更新XML schema，新的schema与现有XML schema向上兼容。
This scenario evolves the XML schema that is upward compatible with the existing XML schema.
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