迭代这些事件的过程中，从DTD事件中提取符号声明并按照名字缓存。
While iterating over the events, you extract notation declarations from the DTD event and cache them by name.
文中提出了一个基于N阶收敛的通用迭代格式来求取矩阵符号函数并给出证明。
The universal iterative scheme based on order N convergency is advanced with a strict proof.
明白符号表及符号表记录，知道如何迭代它们。
Understand symbol tables and symbol table records and how to use iterators.
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