Because of the importance and difficulty in achieving forward compatibility, one of the major goals in XML schema 1.1 is to make it easy to write forward compatible schemas.
由于获得向前兼容性很重要，也比较困难，所以XMLSchema 1.1中的主要目标之一就是让编写向前兼容的模式更为容易。
Because of the importance and difficulty in achieving forward compatibility, one of the major goals in XML schema 1.1 is to make it easy to write forward compatible schemas.
由于获得向前兼容性很重要，也比较困难，所以XMLSchema 1.1中的主要目标之一就是让编写向前兼容的模式更为容易。
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