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Article:
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The .NET Schema Object Model
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| Subject: |
Traversing the Schema Child with Group Reference |
| Date: |
2003-08-01 14:02:57 |
| From: |
Matt Frame |
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Response to: Traversing the Schema Child with Group Reference
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Priya,
Sorry I forgot to append the test schema I am trying to use now with the same problem.
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
<xs:complexType name="TopLevel">
<xs:sequence>
<xs:element name="Elm1"/>
<xs:element name="Elm2"/>
<xs:group ref="GroupOne"/>
</xs:sequence>
</xs:complexType>
<xs:group name="GroupOne">
<xs:sequence>
<xs:element name="GO_Elm1"/>
<xs:element name="GO_Elm2"/>
<xs:group ref="SubGroupOne"/>
</xs:sequence>
</xs:group>
<xs:group name="SubGroupOne">
<xs:sequence>
<xs:element name="SGO_Elm1"/>
<xs:element name="SGO_Elm2"/>
</xs:sequence>
</xs:group>
</xs:schema>
As you can see the first group has a reference to a another group, here SubGroupOne, this is the level I am trying to get an cannot. I cannot find the SubGroupOne name or any information about it when traversing the tree.
Thanks,
Matt
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- Traversing the Schema Child with Group Reference
2003-08-01 15:57:36 Priyamvadha Lakshminarayanan
[Reply]
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);
}
}
}
- 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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