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Editorial Team
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Asked: 2026-05-25T09:39:41+00:00

I am trying to serialize Xml to Bson . This means supporting all child

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I am trying to serialize Xml to Bson. This means supporting all child classes of System.Xml.XmlNode. However, I cannot figure out now to implement an xml document that has an XmlEntity or an XmlNotation in it.

I tried parsing the html 4.0.1 strict dtd with XmlDocument.Load, but I got the following error:

System.Xml.XmlException : 'ENTITY' is an unexpected token. The expected token is 'DOCTYPE'. Line 78, position 3.

Is there another way to end up with an XmlDocument that will have XmlEntity and XmlNotation child nodes?

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1 Answer

  1. Editorial Team

    Problem, which Shellybutterfly began to point out with her suggestion to use SgmlReader, is that I was using a SGML dtd, not an xml dtd. I figured out the format of an xml dtd from w3schools.

    I discovered you need to create an xml document, with a root element and declare the dtd in the DOCTYPE. to be able to load it with XmlDocument.Load(). For my test case I used:

    <!DOCTYPE contact
[
    <!NOTATION PublicNotation PUBLIC 'PublicId' >
    <!NOTATION SystemNotation SYSTEM 'SystemId' >
]>
<contact>
</contact>

    I was able to use that in my tests project.

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