SpinGroupInternalSubsetDeclaration.x3d using X_ITE

X_ITE X3D Browser   SpinGroup PROTO example content to test DTD modularization and extensibility - view XML source to see DTD internal-subset declarations.

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     Original X3D model: SpinGroupInternalSubsetDeclaration.x3d
X3D Examples Archive: https://www.web3d.org/x3d/content/examples/development/SpinGroupInternalSubsetDeclarationIndex.html

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