SDO还提供了一个元数据api，允许应用程序、工具和框架对数据图形的数据模型进行自检。
SDO also provides a metadata API, which allows applications, tools, and frameworks to introspect the data model for a data graph.
但也说明GEF是创建图形化编辑器的最佳框架，因为它与模型无关。
That said, GEF is an excellent framework for creating graphical editors because it is model-agnostic.
Graphical Editor Framework (GEF) 是用于为任意对象模型创建富图形编辑器的框架。
The Graphical Editor Framework (GEF) is a framework for creating rich graphical editors for arbitrary object models.
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