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We want to use GML in our application; It is a GIS based application which simulates the real word objects (i.e. Pipes, Roads, etc) in a virtual reality environment. Currently we draw and store the geometry in AutoCAD DWGs but in future we want to change the Database. I really need to find the answers of these questions.

1- Is GML proper for encoding Geometry file (CAD,Shape,..) That contains more than 100000 features (What is the relation between data Volume and GML performance, is there any limitation?)

2- how can we check the correctness of geometry data, for example how GML Understand that 2 inner Boundaries of a polygon intersect each other, (by Schema? By special Libraries? Or it just validate GML by Schema without check the inner coordinates data)

3-If I want to use a DB, can I store GML data in XML Berkeley Database?

Thanks for your Attention