后架构编译信息集

World Wide Web Consortium (W3C) XML Schema Recommendation（万维网联合会 (W3C) XML 架构建议）讨论必须为架构验证前信息和架构编译后信息公开的信息集。 XML 架构对象模型 (SOM) 在调用 XmlSchemaSet 的 Compile 方法之前或之后查看此信息集。

前架构验证信息集在编辑架构过程中生成。 后架构编译信息集在调用 XmlSchemaSet 的 Compile 方法之后、编译架构期间生成，并以属性的形式公开。

SOM 是表示前架构验证和后架构编译信息集的对象模型；该模型由 System.Xml.Schema 命名空间中的类组成。 System.Xml.Schema 命名空间中的类的所有读取和写入属性属于前架构验证信息集，而 System.Xml.Schema 命名空间中的类的所有只读属性属于后架构编译信息集。 此规则不适用于下列属性，下列属性既是前架构验证信息集属性也是后架构编译信息集属性。

例如，XmlSchemaElement 和 XmlSchemaComplexType 类均具有 BlockResolved 和 FinalResolved 属性。 在编译并验证了架构之后，这些属性用于存放 Block 和 Final 属性的值。 BlockResolved 和 FinalResolved 是属于后架构编译信息集的只读属性。

以下示例显示在验证架构之后设置的 XmlSchemaElement 类的 ElementSchemaType 属性。 在验证之前，该属性包含 null 引用，SchemaTypeName 设置为相应类型的名称。 在验证之后，SchemaTypeName 被解析为有效类型，并且可以通过 ElementSchemaType 属性使用类型对象。

Imports System
Imports System.Xml
Imports System.Xml.Schema

Public Class PsciSample

    Public Shared Sub Main()

        Dim schema As New XmlSchema()

        ' Create an element of type integer and add it to the schema.
        Dim priceElem As New XmlSchemaElement()
        priceElem.Name = "Price"
        priceElem.SchemaTypeName = New XmlQualifiedName("integer", "http://www.w3.org/2001/XMLSchema")
        schema.Items.Add(priceElem)

        ' Print the pre-compilation value of the ElementSchemaType property 
        ' of the XmlSchemaElement which is a PSCI property.
        Console.WriteLine("Before compilation the ElementSchemaType of Price is {0}", priceElem.ElementSchemaType)

        ' Compile the schema which validates the schema and
        ' if valid will place the PSCI values in certain properties.
        Dim schemaSet As New XmlSchemaSet()
        AddHandler schemaSet.ValidationEventHandler, AddressOf ValidationCallbackOne
        schemaSet.Add(schema)
        schemaSet.Compile()

        For Each compiledSchema As XmlSchema In schemaSet.Schemas()
            schema = compiledSchema
        Next

        ' After compilation of the schema, the ElementSchemaType property of the 
        ' XmlSchemaElement will contain a reference to a valid object because the 
        ' SchemaTypeName refered to a valid type.
        Console.WriteLine("After compilation the ElementSchemaType of Price is {0}", _
                priceElem.ElementSchemaType)

    End Sub

    Private Shared Sub ValidationCallbackOne(ByVal sender As Object, ByVal args As ValidationEventArgs)
        Console.WriteLine(args.Message)
    End Sub

End Class

using System;
using System.Xml;
using System.Xml.Schema;

public class PsciSample
{
    public static void Main(string[] args)
    {
        XmlSchema schema = new XmlSchema();

        // Create an element of type integer and add it to the schema.
        XmlSchemaElement priceElem = new XmlSchemaElement();
        priceElem.Name = "Price";
        priceElem.SchemaTypeName = new XmlQualifiedName("integer", "http://www.w3.org/2001/XMLSchema");
        schema.Items.Add(priceElem);

        // Print the pre-compilation value of the ElementSchemaType property 
        // of the XmlSchemaElement which is a PSCI property.
        Console.WriteLine("Before compilation the ElementSchemaType of Price is " + priceElem.ElementSchemaType);

        //Compile the schema which validates the schema and
        // if valid will place the PSCI values in certain properties.
        XmlSchemaSet schemaSet = new XmlSchemaSet();
        schemaSet.ValidationEventHandler += ValidationCallbackOne;
        schemaSet.Add(schema);
        schemaSet.Compile();

        foreach (XmlSchema compiledSchema in schemaSet.Schemas())
        {
            schema = compiledSchema;
        }

        // After compilation of the schema, the ElementSchemaType property of the 
        // XmlSchemaElement will contain a reference to a valid object because the 
        // SchemaTypeName refered to a valid type.
        Console.WriteLine("After compilation the ElementSchemaType of Price is "
           + priceElem.ElementSchemaType);

    }

    private static void ValidationCallbackOne(object sender, ValidationEventArgs args)
    {
        Console.WriteLine(args.Message);
    }

}

#using <System.Xml.dll>

using namespace System;
using namespace System::Xml;
using namespace System::Xml::Schema;

ref class PsciSample
{
private:
    static void ValidationCallbackOne(Object^ sender, ValidationEventArgs^ args)
    {
        Console::WriteLine(args->Message);
    }

public:
    static void Main()
    {
        XmlSchema^ schema = gcnew XmlSchema();

        // Create an element of type integer and add it to the schema.
        XmlSchemaElement^ priceElem = gcnew XmlSchemaElement();
        priceElem->Name = "Price";
        priceElem->SchemaTypeName = gcnew XmlQualifiedName("integer", "http://www.w3.org/2001/XMLSchema");
        schema->Items->Add(priceElem);

        // Print the pre-compilation value of the ElementSchemaType property 
        // of the XmlSchemaElement which is a PSCI property.
        Console::WriteLine("Before compilation the ElementSchemaType of Price is " + priceElem->ElementSchemaType);

        //Compile the schema which validates the schema and
        // if valid will place the PSCI values in certain properties.
        XmlSchemaSet^ schemaSet = gcnew XmlSchemaSet();
        ValidationEventHandler^ eventHanlder = gcnew ValidationEventHandler(ValidationCallbackOne);
        schemaSet->ValidationEventHandler += eventHanlder;
        schemaSet->Add(schema);
        schemaSet->Compile();

        for each (XmlSchema^ compiledSchema in schemaSet->Schemas())
        {
            schema = compiledSchema;
        }

        // After compilation of the schema, the ElementSchemaType property of the 
        // XmlSchemaElement will contain a reference to a valid object because the 
        // SchemaTypeName refered to a valid type.
        Console::WriteLine("After compilation the ElementSchemaType of Price is "
           + priceElem->ElementSchemaType);

    }
};

int main()
{
    PsciSample::Main();
    return 0;
}

请参见

其他资源

XML 架构对象模型 (SOM)