XmlSchemaKeyref クラス

2008-03-28

keyref 制約を識別します。W3C (World Wide Web Consortium) keyref 要素を表します。

この型のすべてのメンバの一覧については、XmlSchemaKeyref メンバを参照してください。

System.Object
   System.Xml.Schema.XmlSchemaObject
      System.Xml.Schema.XmlSchemaAnnotated
         System.Xml.Schema.XmlSchemaIdentityConstraint
            System.Xml.Schema.XmlSchemaKeyref

Public Class XmlSchemaKeyref
   Inherits XmlSchemaIdentityConstraint
[C#]
public class XmlSchemaKeyref : XmlSchemaIdentityConstraint
[C++]
public __gc class XmlSchemaKeyref : public
   XmlSchemaIdentityConstraint
[JScript]
public class XmlSchemaKeyref extends XmlSchemaIdentityConstraint

スレッドセーフ

この型の public static (Visual Basicでは Shared) のすべてのメンバは、マルチスレッド操作で安全に使用できます。インスタンスのメンバの場合は、スレッドセーフであるとは限りません。

解説

属性値または要素値 (または値のセット) は、指定した key 要素または unique 要素の値と対応することを指定します。制約名はスキーマ内で一意である必要があります。

使用例

[Visual Basic, C#, C++] key 要素を作成する例を次に示します。

 
Imports System
Imports System.Collections
Imports System.IO
Imports System.Xml
Imports System.Xml.Xsl
Imports System.Xml.Schema

Public Class XmlSchemaObjectGenerator
   
   Private Shared Sub ValidationCallback(sender As Object, args As ValidationEventArgs)
      
      If args.Severity = XmlSeverityType.Warning Then
         Console.Write("WARNING: ")
      Else
         If args.Severity = XmlSeverityType.Error Then
            Console.Write("ERROR: ")
         End If 
      End If
      Console.WriteLine(args.Message)
   End Sub 'ValidationCallback
   
   
   
   Public Shared Sub Main()
      
      
      Dim tr As New XmlTextReader("empty.xsd")
      Dim schema As XmlSchema = XmlSchema.Read(tr, New ValidationEventHandler(AddressOf ValidationCallback))
      
      schema.ElementFormDefault = XmlSchemaForm.Qualified
      
      schema.TargetNamespace = "http://www.example.com/Report"
      
      If (True) Then
         
         Dim element As New XmlSchemaElement()
         element.Name = "purchaseReport"
         
         Dim element_complexType As New XmlSchemaComplexType()
         
         Dim element_complexType_sequence As New XmlSchemaSequence()
         
         If (True) Then
            
            Dim element_complexType_sequence_element As New XmlSchemaElement()
            element_complexType_sequence_element.Name = "region"
            element_complexType_sequence_element.SchemaTypeName = New XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema")
            
            If (True) Then
               
               Dim element_complexType_sequence_element_keyref As New XmlSchemaKeyref()
               element_complexType_sequence_element_keyref.Name = "dummy2"
               element_complexType_sequence_element_keyref.Selector = New XmlSchemaXPath()
               element_complexType_sequence_element_keyref.Selector.XPath = "r:zip/r:part"
               
               If (True) Then
                  Dim field As New XmlSchemaXPath()
                  
                  field.XPath = "@number"
                  element_complexType_sequence_element_keyref.Fields.Add(field)
               End If
               element_complexType_sequence_element_keyref.Refer = New XmlQualifiedName("pNumKey", "http://www.example.com/Report")
               element_complexType_sequence_element.Constraints.Add(element_complexType_sequence_element_keyref)
            End If
            element_complexType_sequence.Items.Add(element_complexType_sequence_element)
         End If
         element_complexType.Particle = element_complexType_sequence
         
         If (True) Then
            
            Dim element_complexType_attribute As New XmlSchemaAttribute()
            element_complexType_attribute.Name = "periodEnding"
            element_complexType_attribute.SchemaTypeName = New XmlQualifiedName("date", "http://www.w3.org/2001/XMLSchema")
            element_complexType.Attributes.Add(element_complexType_attribute)
         End If
         element.SchemaType = element_complexType
         
         If (True) Then
            
            Dim element_key As New XmlSchemaKey()
            element_key.Name = "pNumKey"
            element_key.Selector = New XmlSchemaXPath()
            element_key.Selector.XPath = "r:parts/r:part"
            
            If (True) Then
               Dim field As New XmlSchemaXPath()
               
               field.XPath = "@number"
               element_key.Fields.Add(field)
            End If
            element.Constraints.Add(element_key)
         End If
         
         schema.Items.Add(element)
      End If
      
      schema.Write(Console.Out)
   End Sub 'Main 
End Class 'XmlSchemaObjectGenerator 

' Main() 

'XmlSchemaObjectGenerator

[C#] 
using System;
using System.Collections;
using System.IO;
using System.Xml;
using System.Xml.Xsl;
using System.Xml.Schema;

public class XmlSchemaObjectGenerator {
  
  

    private static void ValidationCallback(object sender, ValidationEventArgs args ){
  
    if(args.Severity == XmlSeverityType.Warning)
        Console.Write("WARNING: ");
    else if(args.Severity == XmlSeverityType.Error)
        Console.Write("ERROR: ");
  
    Console.WriteLine(args.Message);
    }
                      
            
    public static void Main() {
               
         
      XmlTextReader tr = new XmlTextReader("empty.xsd");
        XmlSchema schema = XmlSchema.Read(tr, new ValidationEventHandler(ValidationCallback));
        
            schema.ElementFormDefault = XmlSchemaForm.Qualified;
        
            schema.TargetNamespace = "http://www.example.com/Report";
        
            {
                
        XmlSchemaElement element = new XmlSchemaElement();
        element.Name = "purchaseReport";
        
        XmlSchemaComplexType element_complexType = new XmlSchemaComplexType();
        
        XmlSchemaSequence element_complexType_sequence = new XmlSchemaSequence();
        
            {
                
        XmlSchemaElement element_complexType_sequence_element = new XmlSchemaElement();
        element_complexType_sequence_element.Name = "region";
        element_complexType_sequence_element.SchemaTypeName = 
                new XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema")
            ;
        
            {
                
        XmlSchemaKeyref element_complexType_sequence_element_keyref = new XmlSchemaKeyref();
        element_complexType_sequence_element_keyref.Name = "dummy2";
        element_complexType_sequence_element_keyref.Selector = new XmlSchemaXPath();
            element_complexType_sequence_element_keyref.Selector.XPath = "r:zip/r:part";
        
            {
                XmlSchemaXPath field = new XmlSchemaXPath();
                
                field.XPath = "@number";
                element_complexType_sequence_element_keyref.Fields.Add(field);
            }
        element_complexType_sequence_element_keyref.Refer =  
                new XmlQualifiedName("pNumKey", "http://www.example.com/Report")
            ;
        element_complexType_sequence_element.Constraints.Add(element_complexType_sequence_element_keyref);
            }
        element_complexType_sequence.Items.Add(element_complexType_sequence_element);
            }
        element_complexType.Particle = element_complexType_sequence;
        
            {
                
        XmlSchemaAttribute element_complexType_attribute = new XmlSchemaAttribute();
        element_complexType_attribute.Name = "periodEnding";
        element_complexType_attribute.SchemaTypeName = 
                new XmlQualifiedName("date", "http://www.w3.org/2001/XMLSchema")
            ;
        element_complexType.Attributes.Add(element_complexType_attribute);
            }
        element.SchemaType = element_complexType;
        
            {
                
        XmlSchemaKey element_key = new XmlSchemaKey();
        element_key.Name = "pNumKey";
        element_key.Selector = new XmlSchemaXPath();
            element_key.Selector.XPath = "r:parts/r:part";
        
            {
                XmlSchemaXPath field = new XmlSchemaXPath();
                
                field.XPath = "@number";
                element_key.Fields.Add(field);
            }
        element.Constraints.Add(element_key);
            }
        
                schema.Items.Add(element);
            }
        
        schema.Write(Console.Out);

         

    }/* Main() */ 

} 
//XmlSchemaObjectGenerator

[C++] 
#using <mscorlib.dll>
#using <System.Xml.dll>
using namespace System;
using namespace System::Collections;
using namespace System::IO;
using namespace System::Xml;
using namespace System::Xml::Xsl;
using namespace System::Xml::Schema;

__gc public class XmlSchemaObjectGenerator
{
public:
   static void ValidationCallback(Object* /*sender*/, ValidationEventArgs * args)
   {
      if (args -> Severity == XmlSeverityType::Warning)
         Console::Write(S"WARNING: ");
      else if (args -> Severity == XmlSeverityType::Error)
         Console::Write(S"ERROR: ");
      Console::WriteLine(args -> Message);
   }
}; // XmlSchemaObjectGenerator

int main()
{
   XmlTextReader* tr = new XmlTextReader(S"empty.xsd");
   XmlSchema * schema = XmlSchema::Read(tr, new ValidationEventHandler(schema, XmlSchemaObjectGenerator::ValidationCallback));

   schema -> ElementFormDefault = XmlSchemaForm::Qualified;

   schema -> TargetNamespace = S"http://www.example.com/Report";
   {
      XmlSchemaElement* element = new XmlSchemaElement();
      element -> Name = S"purchaseReport";

      XmlSchemaComplexType* element_complexType = new XmlSchemaComplexType();

      XmlSchemaSequence* element_complexType_sequence = new XmlSchemaSequence();
      {
         XmlSchemaElement* element_complexType_sequence_element = new XmlSchemaElement();
         element_complexType_sequence_element -> Name = S"region";
         element_complexType_sequence_element -> SchemaTypeName = new XmlQualifiedName(S"String*", S"http://www.w3.org/2001/XMLSchema");
         {
            XmlSchemaKeyref* element_complexType_sequence_element_keyref = new XmlSchemaKeyref();
            element_complexType_sequence_element_keyref -> Name = S"dummy2";
            element_complexType_sequence_element_keyref -> Selector = new XmlSchemaXPath();
            element_complexType_sequence_element_keyref -> Selector -> XPath = S"r:zip/r:part";
            {
               XmlSchemaXPath* field = new XmlSchemaXPath();
               field -> XPath = S"@number";
               element_complexType_sequence_element_keyref -> Fields->Add(field);
            }
            element_complexType_sequence_element_keyref -> Refer = new XmlQualifiedName(S"pNumKey", S"http://www.example.com/Report");
            element_complexType_sequence_element -> Constraints->Add(element_complexType_sequence_element_keyref);
         }
         element_complexType_sequence -> Items->Add(element_complexType_sequence_element);
      }
      element_complexType -> Particle = element_complexType_sequence;
      {
         XmlSchemaAttribute* element_complexType_attribute = new XmlSchemaAttribute();
         element_complexType_attribute -> Name = S"periodEnding";
         element_complexType_attribute -> SchemaTypeName = new XmlQualifiedName(S"date", S"http://www.w3.org/2001/XMLSchema");
         element_complexType -> Attributes->Add(element_complexType_attribute);
      }
      element -> SchemaType = element_complexType;
      {
         XmlSchemaKey* element_key = new XmlSchemaKey();
         element_key -> Name = S"pNumKey";
         element_key -> Selector = new XmlSchemaXPath();
         element_key -> Selector -> XPath = S"r:parts/r:part";
       {
          XmlSchemaXPath* field = new XmlSchemaXPath();
          field -> XPath = S"@number";
          element_key -> Fields->Add(field);
       }
       element -> Constraints->Add(element_key);
      }
      schema -> Items->Add(element);
   }
   schema -> Write(Console::Out);
} // main

[Visual Basic, C#, C++] 前述のコード例に対して生成される XML ファイルを次に示します。

<?xml version="1.0" encoding="IBM437"?>
<xs:schema xmlns:r="http://www.example.com/Report" elementFormDefault="qualified" targetNamespace="http://www.example.com/Report" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="purchaseReport">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="region" type="xs:string">
          <xs:keyref name="dummy2" refer="r:pNumKey">
            <xs:selector xpath="r:zip/r:part" />
            <xs:field xpath="@number" />
          </xs:keyref>
        </xs:element>
      </xs:sequence>
      <xs:attribute name="periodEnding" type="xs:date" />
    </xs:complexType>
    <xs:key name="pNumKey">
      <xs:selector xpath="r:parts/r:part" />
      <xs:field xpath="@number" />
    </xs:key>
  </xs:element>
</xs:schema>

[JScript] JScript のサンプルはありません。Visual Basic、C#、および C++ のサンプルを表示するには、このページの左上隅にある言語のフィルタボタンをクリックします。

必要条件

名前空間: System.Xml.Schema

プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ

アセンブリ: System.Xml (System.Xml.dll 内)

参照

XmlSchemaKeyref メンバ | System.Xml.Schema 名前空間

次の方法で共有

XmlSchemaKeyref クラス

スレッドセーフ

解説

使用例

必要条件

参照

その他のリソース