Itemdata: This is used to represent fields that the DTD does not yet handle.

Itemdata：用于表示DTD尚未处理的字段。

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When a TreeItem widget is created, an ItemData bean is associated with the widget.

在创建TreeIte m部件时，把一个ItemDatabean与这个部件关联起来。

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For instance, a file attachment stored in a Domino document is represented as an itemdata.

例如，Domino文档中存储的文件附件就表示为itemdata。

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For instance, a file attachment stored in a Domino document is represented as an itemdata.

例如，Domino文档中存储的文件附件就表示为itemdata。

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