图形描述语言GraphML（6）:参考资料
GraphML通过XML Schema Definition (xsd)或Document Type Definition (DTD)定义:
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graphml.xsd (Includes the three files below.)
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graphml-structure.xsd Core: structural layer
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graphml-attributes.xsd extension that allow to add base-type attriutes
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graphml-parseinfo.xsd extension that allow to add parsing informstion.
