http://groups.google.com/group/jayrock/t/50be3a3931c39f78

gistfile2.js

[
    "xs:complexType",
    {
        "name": "MyRequest"
    },
    [
        "xs:annotation",
        [
            "xs:documentation",
            "\r\n This is the sample message\r\n"
        ]
    ],
    [
        "xs:sequence",
        [
            "xs:element",
            {
                "minOccurs": "1",
                "name": "requestEnvelope",
                "type": "common:RequestEnvelope"
            }
        ],
        [
            "xs:element",
            {
                "minOccurs": "1",
                "maxOccurs": "1",
                "name": "email",
                "type": "xs:string"
            }
        ],
        [
            "xs:element",
            {
                "minOccurs": "0",
                "maxOccurs": "1",
                "name": "transactionId",
                "type": "xs:string"
            }
        ],
        [
            "xs:element",
            {
                "minOccurs": "0",
                "maxOccurs": "1",
                "name": "trackingId",
                "type": "xs:string"
            }
        ],
        [
            "xs:any",
            {
                "maxOccurs": "unbounded",
                "minOccurs": "0",
                "namespace": "##other",
                "processContents": "lax"
            }
        ]
    ]
]

JsonMLDemo.cs

using System;
using System.IO;
using System.Xml;
using Jayrock.Json;
using Jayrock.JsonML;

public class Program
{
    public static void Main()
    {
        const string @xml = @"
<xs:complexType name='MyRequest'>
<xs:annotation>
<xs:documentation>
 This is the sample message
</xs:documentation>
</xs:annotation>
<xs:sequence>
<xs:element minOccurs='1' name='requestEnvelope'
 type='common:RequestEnvelope' />
<xs:element minOccurs='1' maxOccurs='1'
 name='email' type='xs:string' />
<xs:element minOccurs='0' maxOccurs='1' name='transactionId' type='xs:string'/>
<xs:element minOccurs='0' maxOccurs='1' name='trackingId' type='xs:string'/>
<xs:any maxOccurs='unbounded' minOccurs='0'
 namespace='##other' processContents='lax' />
</xs:sequence>
</xs:complexType>";

        StringWriter jsonw = new StringWriter();
        XmlTextReader reader = new XmlTextReader(new StringReader(xml));
        reader.Namespaces = false;
        
        JsonMLCodec.Encode(reader, new JsonTextWriter(jsonw));

        Console.WriteLine(jsonw);
    }
}