Esquemas XML de edição
Editar um esquema XML é um dos recursos mais importantes do modelo de objeto (SOM) de esquema. Todas as propriedades de pre-esquema- compilação de SOM podem ser usadas para alterar os valores existentes em um esquema XML. O esquema XML pode então ser recompilado para refletir as alterações.
A primeira etapa em editar um esquema carregado no SOM é passar pelo esquema. Você deve estar familiarizado com o atravessamento de um esquema usando o SOM API antes de tentar editar um esquema. Você também deve estar familiarizado com as propriedades pré-compilação e de POST-esquema- compilação de POST-Esquema- compilação - Infoset (PSCI).
Editando um esquema XML
Nesta seção, dois exemplos de código são fornecidos, ambos editar o esquema de cliente criado no tópico Compilar esquemas XML. O primeiro exemplo de código a seguir adiciona um novo elemento de PhoneNumber para o elemento de Customer e o segundo exemplo de código a seguir adiciona um novo atributo de Title para o elemento de FirstName . O primeiro exemplo também usa a coleção de XmlSchema.Elements de POST-esquema- compilação como os meios para percorrer o esquema de cliente quando o segundo exemplo de código usar a coleção de XmlSchema.Items de pre-esquema- compilação.
Exemplo do elemento de PhoneNumber
Isso primeiro exemplo de código a seguir adiciona um novo elemento de PhoneNumber para o elemento de Customer do cliente. O exemplo de código editar o esquema de cliente nas seguintes etapas.
Adiciona o esquema de cliente a um novo objeto de XmlSchemaSet e compilá-lo em seguida. Todos os avisos de validação de esquema e leitura ou compilação encontrada erros o esquema são tratados pelo delegado de ValidationEventHandler .
Recupera o objeto compilada de XmlSchema de XmlSchemaSet iterando sobre a propriedade de Schemas . Porque o esquema é compilado, as propriedades de (PSCI) de POST-Esquema- compilação - Infoset são acessíveis.
Cria o elemento de
PhoneNumberusando a classe de XmlSchemaElement , a restrição de tipo simples dexs:stringusando XmlSchemaSimpleType e XmlSchemaSimpleTypeRestriction classe, adiciona um aspecto padrão da propriedade de Facets de restrição, e adicione a restrição à propriedade de Content do tipo simples e de tipo simples a SchemaType do elemento dePhoneNumber.Efetua iterações sobre cada XmlSchemaElement na coleção de Values de coleção de XmlSchema.Elements de POST-esquema- compilação.
Se QualifiedName do elemento é
"Customer", obtém o tipo complexo do elemento deCustomerusando a classe de XmlSchemaComplexType e a partícula a sequência de tipo complexo usando a classe de XmlSchemaSequence .Adicionar o novo elemento de
PhoneNumbera sequência que contémFirstNamee elementos existentes deLastNameusando a coleção de Items de pre-esquema- compilação de sequência.Finalmente, reprocessa e cria o objeto modificado de XmlSchema usando os métodos de Reprocess e de Compile da classe de XmlSchemaSet e grava no console.
A seguir está o exemplo de código completo.
#using <System.Xml.dll>
using namespace System;
using namespace System::Xml;
using namespace System::Xml::Schema;
ref class XmlSchemaEditExample
{
public:
static void Main()
{
// Add the customer schema to a new XmlSchemaSet and compile it.
// Any schema validation warnings and errors encountered reading or
// compiling the schema are handled by the ValidationEventHandler delegate.
XmlSchemaSet^ schemaSet = gcnew XmlSchemaSet();
schemaSet->ValidationEventHandler += gcnew ValidationEventHandler(ValidationCallback);
schemaSet->Add("http://www.tempuri.org", "customer.xsd");
schemaSet->Compile();
// Retrieve the compiled XmlSchema object from the XmlSchemaSet
// by iterating over the Schemas property.
XmlSchema^ customerSchema = nullptr;
for each (XmlSchema^ schema in schemaSet->Schemas())
{
customerSchema = schema;
}
// Create the PhoneNumber element.
XmlSchemaElement^ phoneElement = gcnew XmlSchemaElement();
phoneElement->Name = "PhoneNumber";
// Create the xs:string simple type restriction.
XmlSchemaSimpleType^ phoneType = gcnew XmlSchemaSimpleType();
XmlSchemaSimpleTypeRestriction^ restriction =
gcnew XmlSchemaSimpleTypeRestriction();
restriction->BaseTypeName = gcnew XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema");
// Add a pattern facet to the restriction.
XmlSchemaPatternFacet^ phonePattern = gcnew XmlSchemaPatternFacet();
phonePattern->Value = "\\d{3}-\\d{3}-\\d(4)";
restriction->Facets->Add(phonePattern);
// Add the restriction to the Content property of the simple type
// and the simple type to the SchemaType of the PhoneNumber element.
phoneType->Content = restriction;
phoneElement->SchemaType = phoneType;
// Iterate over each XmlSchemaElement in the Values collection
// of the Elements property.
for each (XmlSchemaElement^ element in customerSchema->Elements->Values)
{
// If the qualified name of the element is "Customer",
// get the complex type of the Customer element
// and the sequence particle of the complex type.
if (element->QualifiedName->Name->Equals("Customer"))
{
XmlSchemaComplexType^ customerType =
dynamic_cast<XmlSchemaComplexType^>(element->ElementSchemaType);
XmlSchemaSequence^ sequence =
dynamic_cast<XmlSchemaSequence^>(customerType->Particle);
// Add the new PhoneNumber element to the sequence.
sequence->Items->Add(phoneElement);
}
}
// Reprocess and compile the modified XmlSchema object and write it to the console.
schemaSet->Reprocess(customerSchema);
schemaSet->Compile();
customerSchema->Write(Console::Out);
}
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);
}
};
int main()
{
XmlSchemaEditExample::Main();
return 0;
}
using System;
using System.Xml;
using System.Xml.Schema;
class XmlSchemaEditExample
{
static void Main(string[] args)
{
// Add the customer schema to a new XmlSchemaSet and compile it.
// Any schema validation warnings and errors encountered reading or
// compiling the schema are handled by the ValidationEventHandler delegate.
XmlSchemaSet schemaSet = new XmlSchemaSet();
schemaSet.ValidationEventHandler += new ValidationEventHandler(ValidationCallback);
schemaSet.Add("http://www.tempuri.org", "customer.xsd");
schemaSet.Compile();
// Retrieve the compiled XmlSchema object from the XmlSchemaSet
// by iterating over the Schemas property.
XmlSchema customerSchema = null;
foreach (XmlSchema schema in schemaSet.Schemas())
{
customerSchema = schema;
}
// Create the PhoneNumber element.
XmlSchemaElement phoneElement = new XmlSchemaElement();
phoneElement.Name = "PhoneNumber";
// Create the xs:string simple type restriction.
XmlSchemaSimpleType phoneType = new XmlSchemaSimpleType();
XmlSchemaSimpleTypeRestriction restriction =
new XmlSchemaSimpleTypeRestriction();
restriction.BaseTypeName = new XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema");
// Add a pattern facet to the restriction.
XmlSchemaPatternFacet phonePattern = new XmlSchemaPatternFacet();
phonePattern.Value = "\\d{3}-\\d{3}-\\d(4)";
restriction.Facets.Add(phonePattern);
// Add the restriction to the Content property of the simple type
// and the simple type to the SchemaType of the PhoneNumber element.
phoneType.Content = restriction;
phoneElement.SchemaType = phoneType;
// Iterate over each XmlSchemaElement in the Values collection
// of the Elements property.
foreach (XmlSchemaElement element in customerSchema.Elements.Values)
{
// If the qualified name of the element is "Customer",
// get the complex type of the Customer element
// and the sequence particle of the complex type.
if (element.QualifiedName.Name.Equals("Customer"))
{
XmlSchemaComplexType customerType =
element.ElementSchemaType as XmlSchemaComplexType;
XmlSchemaSequence sequence =
customerType.Particle as XmlSchemaSequence;
// Add the new PhoneNumber element to the sequence.
sequence.Items.Add(phoneElement);
}
}
// Reprocess and compile the modified XmlSchema object and write it to the console.
schemaSet.Reprocess(customerSchema);
schemaSet.Compile();
customerSchema.Write(Console.Out);
}
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);
}
}
Imports System.Xml
Imports System.Xml.Schema
Class XmlSchemaEditExample
Shared Sub Main()
' Add the customer schema to a new XmlSchemaSet and compile it.
' Any schema validation warnings and errors encountered reading or
' compiling the schema are handled by the ValidationEventHandler delegate.
Dim schemaSet As XmlSchemaSet = New XmlSchemaSet()
AddHandler schemaSet.ValidationEventHandler, AddressOf ValidationCallback
schemaSet.Add("http://www.tempuri.org", "customer.xsd")
schemaSet.Compile()
' Retrieve the compiled XmlSchema object from the XmlSchemaSet
' by iterating over the Schemas property.
Dim customerSchema As XmlSchema = Nothing
For Each schema As XmlSchema In schemaSet.Schemas()
customerSchema = schema
Next
' Create the PhoneNumber element.
Dim phoneElement As XmlSchemaElement = New XmlSchemaElement()
phoneElement.Name = "PhoneNumber"
' Create the xs:string simple type restriction.
Dim phoneType As XmlSchemaSimpleType = New XmlSchemaSimpleType()
Dim restriction As XmlSchemaSimpleTypeRestriction = _
New XmlSchemaSimpleTypeRestriction()
restriction.BaseTypeName = New XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema")
' Add a pattern facet to the restriction.
Dim phonePattern As XmlSchemaPatternFacet = New XmlSchemaPatternFacet()
phonePattern.Value = "\\d{3}-\\d{3}-\\d(4)"
restriction.Facets.Add(phonePattern)
' Add the restriction to the Content property of the simple type
' and the simple type to the SchemaType of the PhoneNumber element.
phoneType.Content = restriction
phoneElement.SchemaType = phoneType
' Iterate over each XmlSchemaElement in the Values collection
' of the Elements property.
For Each element As XmlSchemaElement In customerSchema.Elements.Values
' If the qualified name of the element is "Customer",
' get the complex type of the Customer element
' and the sequence particle of the complex type.
If element.QualifiedName.Name.Equals("Customer") Then
Dim customerType As XmlSchemaComplexType = _
CType(element.ElementSchemaType, XmlSchemaComplexType)
Dim sequence As XmlSchemaSequence = _
CType(customerType.Particle, XmlSchemaSequence)
' Add the new PhoneNumber element to the sequence.
sequence.Items.Add(phoneElement)
End If
Next
' Reprocess and compile the modified XmlSchema object and write it to the console.
schemaSet.Reprocess(customerSchema)
schemaSet.Compile()
customerSchema.Write(Console.Out)
End Sub
Shared Sub ValidationCallback(ByVal sender As Object, ByVal 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
End Class
A seguir, o esquema modificado de cliente criado no tópico Compilar esquemas XML.
<?xml version="1.0" encoding="utf-8"?>
<xs:schema xmlns:tns="http://www.tempuri.org" targetNamespace="http://www.tempuri.org" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="Customer">
<xs:complexType>
<xs:sequence>
<xs:element name="FirstName" type="xs:string" />
<xs:element name="LastName" type="tns:LastNameType" />
<xs:element name="PhoneNumber"> <xs:simpleType> <xs:restriction base="xs:string"> <xs:pattern value="\d{3}-\d{3}-\d(4)" /> </xs:restriction> </xs:simpleType> </xs:element>
</xs:sequence>
<xs:attribute name="CustomerId" type="xs:positiveInteger" use="required" />
</xs:complexType>
</xs:element>
<xs:simpleType name="LastNameType">
<xs:restriction base="xs:string">
<xs:maxLength value="20" />
</xs:restriction>
</xs:simpleType>
</xs:schema>
Exemplo de atributo de título
O segundo exemplo de código, adicione um novo atributo de Title para o elemento de FirstName do cliente. No primeiro exemplo de código, o tipo de elemento de FirstName é xs:string. Para o elemento de FirstName tem um atributo juntamente com o conteúdo de cadeia de caracteres, seu tipo deve ser alterado para um tipo complexo com um modelo de conteúdo de conteúdo simples de extensão.
O exemplo de código editar o esquema de cliente nas seguintes etapas.
Adiciona o esquema de cliente a um novo objeto de XmlSchemaSet e compilá-lo em seguida. Todos os avisos de validação de esquema e leitura ou compilação encontrada erros o esquema são tratados pelo delegado de ValidationEventHandler .
Recupera o objeto compilada de XmlSchema de XmlSchemaSet iterando sobre a propriedade de Schemas . Porque o esquema é compilado, as propriedades de (PSCI) de POST-Esquema- compilação - Infoset são acessíveis.
Cria um novo tipo complexo para o elemento de
FirstNameusando a classe de XmlSchemaComplexType .Cria uma nova extensão de conteúdo simples, com um tipo base de
xs:string, usando as classes de XmlSchemaSimpleContent e de XmlSchemaSimpleContentExtension .Cria o novo atributo de
Titleusando a classe de XmlSchemaAttribute , com SchemaTypeName dexs:stringe adicione o atributo a extensão de conteúdo simples.Defina o modelo de conteúdo de conteúdo simples para a extensão de conteúdo simples e o modelo de conteúdo do tipo complexo para o conteúdo simples.
Adicionar o novo tipo complexo à coleção de XmlSchema.Items de pre-esquema- compilação.
Efetua iterações sobre cada XmlSchemaObject na coleção de XmlSchema.Items de pre-esquema- compilação.
Observação
Como o elemento de FirstName não é um elemento global no esquema, não está disponível em coleções de XmlSchema.Items ou de XmlSchema.Elements . O exemplo de código posicionar o elemento de FirstName posicionando o primeiro elemento de Customer .
O primeiro exemplo de código atravessou o esquema usando a coleção de XmlSchema.Elements de POST-esquema- compilação. Nesse exemplo, a coleção de XmlSchema.Items de pre-esquema- compilação é usada para percorrer o esquema. Quando ambas as coleções fornecem acesso aos elementos globais no esquema, iterar através da coleção de Items é mais demorado porque você deve iterar todos os elementos globais no esquema e não tem nenhuma propriedades de PSCI. Coleções de PSCI (XmlSchema.Elements, XmlSchema.Attributes, XmlSchema.SchemaTypes, e assim por diante) fornecem acesso direto a seus elementos, atributos globais, tipos e suas propriedades de PSCI.
Se XmlSchemaObject é um elemento, cujo QualifiedName é
"Customer", obtém o tipo complexo do elemento deCustomerusando a classe de XmlSchemaComplexType e a partícula a sequência de tipo complexo usando a classe de XmlSchemaSequence .Efetua iterações sobre cada XmlSchemaParticle na coleção de XmlSchemaSequence.Items de pre-esquema- compilação.
Se XmlSchemaParticle é um elemento, que é QualifiedName é
"FirstName", define SchemaTypeName do elemento deFirstNamepara o novo tipo complexo deFirstName.Finalmente, reprocessa e cria o objeto modificado de XmlSchema usando os métodos de Reprocess e de Compile da classe de XmlSchemaSet e grava no console.
A seguir está o exemplo de código completo.
#using <System.Xml.dll>
using namespace System;
using namespace System::Xml;
using namespace System::Xml::Schema;
ref class XmlSchemaEditExample
{
public:
static void Main()
{
// Add the customer schema to a new XmlSchemaSet and compile it.
// Any schema validation warnings and errors encountered reading or
// compiling the schema are handled by the ValidationEventHandler delegate.
XmlSchemaSet^ schemaSet = gcnew XmlSchemaSet();
schemaSet->ValidationEventHandler += gcnew ValidationEventHandler(ValidationCallback);
schemaSet->Add("http://www.tempuri.org", "customer.xsd");
schemaSet->Compile();
// Retrieve the compiled XmlSchema object from the XmlSchemaSet
// by iterating over the Schemas property.
XmlSchema^ customerSchema = nullptr;
for each (XmlSchema^ schema in schemaSet->Schemas())
{
customerSchema = schema;
}
// Create a complex type for the FirstName element.
XmlSchemaComplexType^ complexType = gcnew XmlSchemaComplexType();
complexType->Name = "FirstNameComplexType";
// Create a simple content extension with a base type of xs:string.
XmlSchemaSimpleContent^ simpleContent = gcnew XmlSchemaSimpleContent();
XmlSchemaSimpleContentExtension^ simpleContentExtension =
gcnew XmlSchemaSimpleContentExtension();
simpleContentExtension->BaseTypeName =
gcnew XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema");
// Create the new Title attribute with a SchemaTypeName of xs:string
// and add it to the simple content extension.
XmlSchemaAttribute^ attribute = gcnew XmlSchemaAttribute();
attribute->Name = "Title";
attribute->SchemaTypeName =
gcnew XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema");
simpleContentExtension->Attributes->Add(attribute);
// Set the content model of the simple content to the simple content extension
// and the content model of the complex type to the simple content.
simpleContent->Content = simpleContentExtension;
complexType->ContentModel = simpleContent;
// Add the new complex type to the pre-schema-compilation Items collection.
customerSchema->Items->Add(complexType);
// Iterate over each XmlSchemaObject in the pre-schema-compilation
// Items collection.
for each (XmlSchemaObject^ schemaObject in customerSchema->Items)
{
// If the XmlSchemaObject is an element, whose QualifiedName
// is "Customer", get the complex type of the Customer element
// and the sequence particle of the complex type.
if (schemaObject::typeid == XmlSchemaElement::typeid)
{
XmlSchemaElement^ element = dynamic_cast<XmlSchemaElement^>(schemaObject);
if (element->QualifiedName->Name->Equals("Customer"))
{
XmlSchemaComplexType^ customerType =
dynamic_cast<XmlSchemaComplexType^>(element->ElementSchemaType);
XmlSchemaSequence^ sequence =
dynamic_cast<XmlSchemaSequence^>(customerType->Particle);
// Iterate over each XmlSchemaParticle in the pre-schema-compilation
// Items property.
for each (XmlSchemaParticle^ particle in sequence->Items)
{
// If the XmlSchemaParticle is an element, who's QualifiedName
// is "FirstName", set the SchemaTypeName of the FirstName element
// to the new FirstName complex type.
if (particle::typeid == XmlSchemaElement::typeid)
{
XmlSchemaElement^ childElement =
dynamic_cast<XmlSchemaElement^>(particle);
if (childElement->Name->Equals("FirstName"))
{
childElement->SchemaTypeName =
gcnew XmlQualifiedName("FirstNameComplexType",
"http://www.tempuri.org");
}
}
}
}
}
}
// Reprocess and compile the modified XmlSchema object and write it to the console.
schemaSet->Reprocess(customerSchema);
schemaSet->Compile();
customerSchema->Write(Console::Out);
}
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);
}
};
int main()
{
XmlSchemaEditExample::Main();
return 0;
}
using System;
using System.Xml;
using System.Xml.Schema;
class XmlSchemaEditExample
{
static void Main(string[] args)
{
// Add the customer schema to a new XmlSchemaSet and compile it.
// Any schema validation warnings and errors encountered reading or
// compiling the schema are handled by the ValidationEventHandler delegate.
XmlSchemaSet schemaSet = new XmlSchemaSet();
schemaSet.ValidationEventHandler += new ValidationEventHandler(ValidationCallback);
schemaSet.Add("http://www.tempuri.org", "customer.xsd");
schemaSet.Compile();
// Retrieve the compiled XmlSchema object from the XmlSchemaSet
// by iterating over the Schemas property.
XmlSchema customerSchema = null;
foreach (XmlSchema schema in schemaSet.Schemas())
{
customerSchema = schema;
}
// Create a complex type for the FirstName element.
XmlSchemaComplexType complexType = new XmlSchemaComplexType();
complexType.Name = "FirstNameComplexType";
// Create a simple content extension with a base type of xs:string.
XmlSchemaSimpleContent simpleContent = new XmlSchemaSimpleContent();
XmlSchemaSimpleContentExtension simpleContentExtension =
new XmlSchemaSimpleContentExtension();
simpleContentExtension.BaseTypeName =
new XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema");
// Create the new Title attribute with a SchemaTypeName of xs:string
// and add it to the simple content extension.
XmlSchemaAttribute attribute = new XmlSchemaAttribute();
attribute.Name = "Title";
attribute.SchemaTypeName =
new XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema");
simpleContentExtension.Attributes.Add(attribute);
// Set the content model of the simple content to the simple content extension
// and the content model of the complex type to the simple content.
simpleContent.Content = simpleContentExtension;
complexType.ContentModel = simpleContent;
// Add the new complex type to the pre-schema-compilation Items collection.
customerSchema.Items.Add(complexType);
// Iterate over each XmlSchemaObject in the pre-schema-compilation
// Items collection.
foreach (XmlSchemaObject schemaObject in customerSchema.Items)
{
// If the XmlSchemaObject is an element, whose QualifiedName
// is "Customer", get the complex type of the Customer element
// and the sequence particle of the complex type.
if (schemaObject is XmlSchemaElement)
{
XmlSchemaElement element = schemaObject as XmlSchemaElement;
if (element.QualifiedName.Name.Equals("Customer"))
{
XmlSchemaComplexType customerType =
element.ElementSchemaType as XmlSchemaComplexType;
XmlSchemaSequence sequence =
customerType.Particle as XmlSchemaSequence;
// Iterate over each XmlSchemaParticle in the pre-schema-compilation
// Items property.
foreach (XmlSchemaParticle particle in sequence.Items)
{
// If the XmlSchemaParticle is an element, who's QualifiedName
// is "FirstName", set the SchemaTypeName of the FirstName element
// to the new FirstName complex type.
if (particle is XmlSchemaElement)
{
XmlSchemaElement childElement =
particle as XmlSchemaElement;
if (childElement.Name.Equals("FirstName"))
{
childElement.SchemaTypeName =
new XmlQualifiedName("FirstNameComplexType",
"http://www.tempuri.org");
}
}
}
}
}
}
// Reprocess and compile the modified XmlSchema object and write it to the console.
schemaSet.Reprocess(customerSchema);
schemaSet.Compile();
customerSchema.Write(Console.Out);
}
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);
}
}
Imports System.Xml
Imports System.Xml.Schema
Class XmlSchemaEditExample
Shared Sub Main()
' Add the customer schema to a new XmlSchemaSet and compile it.
' Any schema validation warnings and errors encountered reading or
' compiling the schema are handled by the ValidationEventHandler delegate.
Dim schemaSet As XmlSchemaSet = New XmlSchemaSet()
AddHandler schemaSet.ValidationEventHandler, AddressOf ValidationCallback
schemaSet.Add("http://www.tempuri.org", "customer.xsd")
schemaSet.Compile()
' Retrieve the compiled XmlSchema object from the XmlSchemaSet
' by iterating over the Schemas property.
Dim customerSchema As XmlSchema = Nothing
For Each schema As XmlSchema In schemaSet.Schemas()
customerSchema = schema
Next
' Create a complex type for the FirstName element.
Dim complexType As XmlSchemaComplexType = New XmlSchemaComplexType()
complexType.Name = "FirstNameComplexType"
' Create a simple content extension with a base type of xs:string.
Dim simpleContent As XmlSchemaSimpleContent = New XmlSchemaSimpleContent()
Dim simpleContentExtension As XmlSchemaSimpleContentExtension = _
New XmlSchemaSimpleContentExtension()
simpleContentExtension.BaseTypeName = _
New XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema")
' Create the new Title attribute with a SchemaTypeName of xs:string
' and add it to the simple content extension.
Dim attribute As XmlSchemaAttribute = New XmlSchemaAttribute()
attribute.Name = "Title"
attribute.SchemaTypeName = _
New XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema")
simpleContentExtension.Attributes.Add(attribute)
' Set the content model of the simple content to the simple content extension
' and the content model of the complex type to the simple content.
simpleContent.Content = simpleContentExtension
complexType.ContentModel = simpleContent
' Add the new complex type to the pre-schema-compilation Items collection.
customerSchema.Items.Add(complexType)
' Iterate over each XmlSchemaObject in the pre-schema-compilation
' Items collection.
For Each schemaObject As XmlSchemaObject In customerSchema.Items
' If the XmlSchemaObject is an element, whose QualifiedName
' is "Customer", get the complex type of the Customer element
' and the sequence particle of the complex type.
If schemaObject.GetType() Is GetType(XmlSchemaElement) Then
Dim element As XmlSchemaElement = CType(schemaObject, XmlSchemaElement)
If (element.QualifiedName.Name.Equals("Customer")) Then
Dim customerType As XmlSchemaComplexType = _
CType(element.ElementSchemaType, XmlSchemaComplexType)
Dim sequence As XmlSchemaSequence = _
CType(customerType.Particle, XmlSchemaSequence)
' Iterate over each XmlSchemaParticle in the pre-schema-compilation
' Items property.
For Each particle As XmlSchemaParticle In sequence.Items
' If the XmlSchemaParticle is an element, who's QualifiedName
' is "FirstName", set the SchemaTypeName of the FirstName element
' to the new FirstName complex type.
If particle.GetType() Is GetType(XmlSchemaElement) Then
Dim childElement As XmlSchemaElement = _
CType(particle, XmlSchemaElement)
If childElement.Name.Equals("FirstName") Then
childElement.SchemaTypeName = _
New XmlQualifiedName("FirstNameComplexType", _
"http://www.tempuri.org")
End If
End If
Next
End If
End If
Next
' Reprocess and compile the modified XmlSchema object and write it to the console.
schemaSet.Reprocess(customerSchema)
schemaSet.Compile()
customerSchema.Write(Console.Out)
End Sub
Shared Sub ValidationCallback(ByVal sender As Object, ByVal 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
End Class
A seguir, o esquema modificado de cliente criado no tópico Compilar esquemas XML.
<?xml version="1.0" encoding=" utf-8"?>
<xs:schema xmlns:tns="http://www.tempuri.org" targetNamespace="http://www.tempuri.org" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="Customer">
<xs:complexType>
<xs:sequence>
<xs:element name="FirstName" type="tns:FirstNameComplexType" />
<xs:element name="LastName" type="tns:LastNameType" />
</xs:sequence>
<xs:attribute name="CustomerId" type="xs:positiveInteger" use="required" />
</xs:complexType>
</xs:element>
<xs:simpleType name="LastNameType">
<xs:restriction base="xs:string">
<xs:maxLength value="20" />
</xs:restriction>
</xs:simpleType>
<xs:complexType name="FirstNameComplexType"> <xs:simpleContent> <xs:extension base="xs:string"> <xs:attribute name="Title" type="xs:string" /> </xs:extension> </xs:simpleContent> </xs:complexType>
</xs:schema>
