这是一种新型表达式语言，拥有优秀的集合、对象图遍历和索引支持功能。

This is the newer form of expression languages and has excellent collection, object graph traversal, and indexing support.

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每个文件系统有它自己的索引号集合。

Each filesystem has its own set of index Numbers.

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但有些比较困难，比如在一个已被索引的集合里如何处理对象的更新。

The harder ones include how to handle updates to objects in an indexed collection.

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