| 摘要 |
A method and system for organizing nodes within a program tree. The system allows various child node categories to be defined for node types of a program tree. When a child node is added to a parent node, the system identifies the category of the child node. The system then instantiates a category data structure for the identified category. The system stores a reference to the instantiated category data structure in the parent node and stores a reference to the child node in the instantiated category data structure.
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