This is a bug having to do with unaries in the orginal ORM diagram, and I will be reporting it as such.
Until then, here is why the OIAL to DCIL bombs out.
#error Exception occurred while executing transform 'OIALtoDCIL'. The existing contents of 'ORMModel1.DCIL.xml' will not be modified.
// System.ArgumentNullException
// Value cannot be null.
//Parameter name: name
// at System.Xml.Xsl.CompiledQuery.Script1.makeValidIdentifier(String name, Int32 maxLength)
// at System.Xml.Xsl.CompiledQuery.Script1.makeValidIdentifier(String name)
// at <xsl:template match="oil:model">(XmlQueryRuntime {urn:schemas-microsoft-com:xslt-debug}runtime, XPathNavigator {urn:schemas-microsoft-com:xslt-debug}current)
// at <xsl:apply-templates>(XmlQueryRuntime {urn:schemas-microsoft-com:xslt-debug}runtime, XPathNavigator )
// at Root(XmlQueryRuntime {urn:schemas-microsoft-com:xslt-debug}runtime)
// at Execute(XmlQueryRuntime {urn:schemas-microsoft-com:xslt-debug}runtime)
// at System.Xml.Xsl.ExecuteDelegate.Invoke(XmlQueryRuntime runtime)
// at System.Xml.Xsl.XmlILCommand.Execute(Object defaultDocument, XmlResolver dataSources, XsltArgumentList argumentList, XmlSequenceWriter results)
// at System.Xml.Xsl.XmlILCommand.Execute(Object defaultDocument, XmlResolver dataSources, XsltArgumentList argumentList, XmlWriter writer, Boolean closeWriter)
// at System.Xml.Xsl.XmlILCommand.Execute(XmlReader contextDocument, XmlResolver dataSources, XsltArgumentList argumentList, XmlWriter results)
// at System.Xml.Xsl.XslCompiledTransform.Transform(XmlReader input, XsltArgumentList arguments, XmlWriter results)
// at Neumont.Tools.ORM.ORMCustomTool.ORMCustomTool.XslORMGenerator.GenerateOutput(BuildItem buildItem, Stream outputStream, IDictionary`2 inputFormatStreams, String defaultNamespace) in c:\Documents and Settings\mcurland\My Documents\Visual Studio 2005\Projects\ORMPackage\Tools\ORMCustomTool\XslORMGenerator.cs:line 224
// at Neumont.Tools.ORM.ORMCustomTool.ORMCustomTool.GenerateCode(String bstrInputFileContents, String wszDefaultNamespace, IVsGeneratorProgress pGenerateProgress, WriteReportItem report) in c:\Documents and Settings\mcurland\My Documents\Visual Studio 2005\Projects\ORMPackage\Tools\ORMCustomTool\ORMCustomTool.cs:line 575