For other requirements for upward compatibility refer to the DB2 Information Center and the developerWorks article Evolving your XML schemas using DB2 pureXML . See Resources for the links .

要了解 向 上 兼容性的其他要求，请参阅DB2信息中心和developerWorks文章“EvolvingyourXMLschemasusingDB2pureXML”（参见参考资料中的链接）。

I 've already mentioned the problem about evolving an XML schema with upward compatibility where the existence of newly added elements and attributes cannot be checked .

我已经提到过具有 向 上 兼容性的XMLschema更新的问题，即不能检查新添加的元素和属性是否存在。

Evolve the XML schema ( upward compatibility )

更新XMLschema（ 向 上 兼容性）

A concern with evolving XML schema with upward compatibility is that XML data cannot be validated with the existence of newly added elements and attributes .

使用 向 上 兼容性更新XMLschema时需要考虑的一个问题是：XML数据具有新添加的元素和属性时不能通过验证。

These features result in decreasing the design errors in circuit design and making upward compatibility easier .

这样能有效地减少电路设计中可能存在的设计错误，并且使得电路 向 上 兼容更容易。

However the API may evolve or be entirely replaced in future releases so upward compatibility may not be present .

但是，该API可能会发生演化，或者在将来的版本中被完全取代，所以可能不具有 向 上 兼容性。