Is upward compatible with the XML schema cust1.xsd so that cust1.xsd can be replaced with cust2.xsd.
XML schema cust2 . xsd与XML schema cust1 . xsd向上兼容，因此cust1 . xsd可以被cust2 . xsd替换。
This scenario evolves the XML schema that is upward compatible with the existing XML schema.
这个场景更新XML schema，新的schema与现有XML schema向上兼容。
If the XML schema is evolved as upward compatible with the existing XML schema, the existing XML data can be managed with the new XML schema without any modifications.
如果XML schema被更新为与现有XML schema具有向上兼容性，则现有XML数据无需任何更改就可以通过新的XML schema进行管理。
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