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Article:
The .NET Schema Object Model
Subject: Traversing the Schema Child with Group Reference
Date: 2003-08-01 15:57:36
From: Priyamvadha Lakshminarayanan
Response to: Traversing the Schema Child with Group Reference
XmlSchemaGroupRef does not have the pre-compiled particle on it. Hence you need to look up the group from the RefName and then drill down further:
The following output is generated by the code sample below for the schema you posted:


Seq, All or Choice
XmlSchemaElement: Elm1
XmlSchemaElement: Elm2
Group ref
Seq, All or Choice
XmlSchemaElement: GO_Elm1
XmlSchemaElement: GO_Elm2
Group ref
Seq, All or Choice
XmlSchemaElement: SGO_Elm1
XmlSchemaElement: SGO_Elm2


Notice the two groupRefs printed.


private void PrintParticles(string url) {
XmlSchema schema = XmlSchema.Read(new XmlTextReader(url, new NameTable()), new ValidationEventHandler(ValidationCallback));
schema.Compile(new ValidationEventHandler(ValidationCallback));
foreach(XmlSchemaType type in schema.SchemaTypes.Values) {
XmlSchemaComplexType complexType = type as XmlSchemaComplexType;
if (complexType != null) {
TraverseParticle(complexType.Particle, schema);
}
}

foreach(XmlSchemaElement elem in schema.Elements) {
XmlSchemaComplexType complexType = elem.ElementType as XmlSchemaComplexType;
if (complexType != null && complexType.QualifiedName == XmlQualifiedName.Empty) { //Only local types of an element
TraverseParticle(complexType.Particle, schema);
}
}
}

private void TraverseParticle(XmlSchemaParticle particle, XmlSchema schema) {
if (particle is XmlSchemaElement) {
XmlSchemaElement elem = particle as XmlSchemaElement;
Console.WriteLine("XmlSchemaElement: " + elem.QualifiedName.ToString());
}
else if (particle is XmlSchemaGroupRef) {
XmlSchemaGroupRef groupRef = particle as XmlSchemaGroupRef;
Console.WriteLine("Group ref");
XmlSchemaGroup group = (XmlSchemaGroup)schema.Groups[groupRef.RefName]; //Get the group
TraverseParticle(group.Particle, schema);
}
else if (particle is XmlSchemaGroupBase) {
Console.WriteLine("Seq, All or Choice");
XmlSchemaGroupBase baseParticle = particle as XmlSchemaGroupBase;
foreach(XmlSchemaParticle subParticle in baseParticle.Items) {
TraverseParticle(subParticle, schema);
}
}
}

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  • Traversing the XML Schema
    2006-05-02 20:48:01 Forum [Reply]

    Hi friends


    this is my xsd file


    <?xml version="1.0" encoding="utf-8"?>
    <xs:schema targetNamespace="http://tempuri.org/XMLSchema.xsd" elementFormDefault="qualified" xmlns="http://tempuri.org/XMLSchema.xsd" xmlns:mstns="http://tempuri.org/XMLSchema.xsd" xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <!-- -->
    <xs:element name="Plan">
    <xs:complexType>
    <xs:sequence>
    <xs:element name="Patient_Data">
    <xs:complexType>
    <xs:sequence>
    <xs:element name="Name_of_Patient" type="xs:string" />
    <xs:element name="Patient_ID" type="xs:string" />
    <xs:element name="Clinical_Record" type="xs:string" />
    <xs:element name="Site_of_Target_Vol" type="xs:string" />
    </xs:sequence>
    </xs:complexType>
    </xs:element>
    <xs:element name="General_Data">
    <xs:complexType>
    <xs:sequence>
    <xs:element name="Planned_on" type="xs:date" />
    <xs:element name="Planned_by" type="xs:string" />
    <xs:element name="Date_of_Protocol" type="xs:dateTime" />
    <xs:element name="Number_of_Pages_Protocol" type="xs:int" />
    <xs:element name="Image_Series_ID" type="xs:int" />
    <xs:element name="Target_Point_Mode" type="xs:string" />
    <xs:element name="Device_Coord_Syst" type="xs:string" />
    </xs:sequence>
    </xs:complexType>
    </xs:element>
    </xs:sequence>
    </xs:complexType>
    </xs:element>
    </xs:schema>


    i want to display or print all the elements in the schema., the elements are like "plan" under this "Patient_data and General_data" and under patient_data it has some sub elements. How can i traverse all the elemetns in the file. I tried like this


    XmlTextReader reader = new XmlTextReader(@"E:\XmlTest\Test\PatientData.xsd");
    try
    {
    XmlSchema schema = XmlSchema.Read(reader, null);
    schema.Compile(null);
    if (schema.IsCompiled)
    {
    MessageBox.Show("Inside");
    foreach (XmlSchemaElement parentElement in schema.Elements.Values)
    {
    MessageBox.Show(parentElement.Name.ToString());
    XmlSchemaComplexType ct = parentElement.ElementType as XmlSchemaComplexType; //Casting to complex type
    if (ct != null)
    {
    XmlSchemaSequence seq = (XmlSchemaSequence)ct.ContentTypeParticle;
    foreach (XmlSchemaElement elem in seq.Items)
    {
    MessageBox.Show(elem.Name.ToString());
    }
    }
    }
    it displays only plan and patient_data and General_data it is not displaying sub elements. Can u please tell me where the problem is? share ur ideas


    Thanks in advance


    Regards


  • Traversing the Schema Child with Group Reference
    2003-08-02 22:36:39 Matt Frame [Reply]

    Priya,


    Thank you so much for helping me out with this. I am getting a much better understanding of schema's and the SOM because of your help. I have one last question though.


    Is it possible to be in SubGroupOne and find out which parent you came from? I guess I am asking can you traverse the tree in reverse if need be.


    Thanks,


    Matt


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