Extensions.GetSchemaInfo Method

Definition

Gets the post-schema-validation infoset (PSVI) of a validated node.

Overloads

GetSchemaInfo(XAttribute)

Gets the post-schema-validation infoset (PSVI) of a validated attribute.

GetSchemaInfo(XElement)

Gets the post-schema-validation infoset (PSVI) of a validated element.

Remarks

After you have validated an XDocument, you can retrieve the post-schema-validation infoset for an XElement or XAttribute that is contained in the document.

After retrieving the IXmlSchemaInfo object, you can use the SchemaAttribute or SchemaElement properties to get a partial validation type (XmlSchemaElement or XmlSchemaAttribute). You can use the partial validation types to validate an attribute or a sub-tree.

GetSchemaInfo(XAttribute)

Gets the post-schema-validation infoset (PSVI) of a validated attribute.

public:
[System::Runtime::CompilerServices::Extension]
 static System::Xml::Schema::IXmlSchemaInfo ^ GetSchemaInfo(System::Xml::Linq::XAttribute ^ source);
public static System.Xml.Schema.IXmlSchemaInfo GetSchemaInfo (this System.Xml.Linq.XAttribute source);
static member GetSchemaInfo : System.Xml.Linq.XAttribute -> System.Xml.Schema.IXmlSchemaInfo
<Extension()>
Public Function GetSchemaInfo (source As XAttribute) As IXmlSchemaInfo

Parameters

source
XAttribute

An XAttribute that has been previously validated.

Returns

A IXmlSchemaInfo that contains the post-schema-validation infoset for an XAttribute.

Remarks

You can use the IXmlSchemaInfo returned by this method to determine certain characteristics of a validated attribute. For example, you can determine if the attribute came from a default attribute value in an XSD.

You use the SchemaAttribute property to get a partial validation type (XmlSchemaAttribute). You can use it to revalidate an attribute without validating an entire document.

For an example of this property, see Validate.

GetSchemaInfo(XElement)

Gets the post-schema-validation infoset (PSVI) of a validated element.

public:
[System::Runtime::CompilerServices::Extension]
 static System::Xml::Schema::IXmlSchemaInfo ^ GetSchemaInfo(System::Xml::Linq::XElement ^ source);
public static System.Xml.Schema.IXmlSchemaInfo GetSchemaInfo (this System.Xml.Linq.XElement source);
static member GetSchemaInfo : System.Xml.Linq.XElement -> System.Xml.Schema.IXmlSchemaInfo
<Extension()>
Public Function GetSchemaInfo (source As XElement) As IXmlSchemaInfo

Parameters

source
XElement

An XElement that has been previously validated.

Returns

A IXmlSchemaInfo that contains the post-schema-validation infoset (PSVI) for an XElement.

Examples

The following example populates the tree with a PSVI. After validation, it prints all elements and attributes in the tree that are invalid according to the PSVI.

  
                static void DumpInvalidNodes(XElement el)  
{  
    if (el.GetSchemaInfo().Validity != XmlSchemaValidity.Valid)  
        Console.WriteLine("Invalid Element {0}",  
            el.AncestorsAndSelf()  
            .InDocumentOrder()  
            .Aggregate("", (s, i) => s + "/" + i.Name.ToString()));  
    foreach (XAttribute att in el.Attributes())  
        if (att.GetSchemaInfo().Validity != XmlSchemaValidity.Valid)  
            Console.WriteLine("Invalid Attribute {0}",  
                att  
                .Parent  
                .AncestorsAndSelf()  
                .InDocumentOrder()  
                .Aggregate("",  
                    (s, i) => s + "/" + i.Name.ToString()) + "/@" + att.Name.ToString()  
                );  
    foreach (XElement child in el.Elements())  
        DumpInvalidNodes(child);  
}  
  
static void Main(string[] args)  
{  
    string xsdMarkup =  
         @"<xsd:schema xmlns:xsd='http://www.w3.org/2001/XMLSchema'>  
   <xsd:simpleType name='GCType'>  
    <xsd:restriction base='xsd:token'>  
     <xsd:enumeration value='AAA'/>  
     <xsd:enumeration value='BBB'/>  
    </xsd:restriction>  
   </xsd:simpleType>  
   <xsd:element name='Root'>  
    <xsd:complexType>  
     <xsd:sequence>  
      <xsd:element name='Child1' minOccurs='1' maxOccurs='1'>  
       <xsd:complexType>  
        <xsd:sequence>  
         <xsd:element name='GrandChild1' type='GCType'/>  
         <xsd:element name='GrandChild2' type='GCType'/>  
         <xsd:element name='GrandChild3' type='GCType'/>  
        </xsd:sequence>  
       </xsd:complexType>  
      </xsd:element>  
     </xsd:sequence>  
    </xsd:complexType>  
   </xsd:element>  
  </xsd:schema>";  
  
    XmlSchemaSet schemas = new XmlSchemaSet();  
    schemas.Add("", XmlReader.Create(new StringReader(xsdMarkup)));  
  
    XDocument doc1 = new XDocument(  
        new XElement("Root",  
            new XElement("Child1",  
                new XElement("GrandChild1", "AAA"),  
                new XElement("GrandChild2", "ZZZ"),  
                new XElement("GrandChild3", "ZZZ")  
            )  
        )  
    );  
  
    Console.WriteLine("Validating doc1 ...");  
    bool errors = false;  
    doc1.Validate(schemas, (sender, e) =>  
    {  
        Console.WriteLine(e.Message);  
        errors = true;  
    }, true);  
    Console.WriteLine("doc1 {0}", errors ? "did not validate" : "validated");  
    DumpInvalidNodes(doc1.Root);  
}  
  
                Private Sub DumpInvalidNodes(ByVal el As XElement)  
    If el.GetSchemaInfo.Validity <> XmlSchemaValidity.Valid Then  
        Console.WriteLine("Invalid Element {0}", _  
            el _  
            .AncestorsAndSelf _  
            .InDocumentOrder() _  
            .Aggregate("", _  
                Function(ByVal s, ByVal i) s + "/" + i.Name.ToString()))  
    End If  
    For Each att As XAttribute In el.Attributes()  
        If att.GetSchemaInfo.Validity <> XmlSchemaValidity.Valid Then  
            Console.WriteLine("Invalid Attribute {0}", _  
                att _  
                .Parent _  
                .AncestorsAndSelf() _  
                .InDocumentOrder() _  
                .Aggregate("", _  
                    Function(ByVal s, ByVal i) s + "/" + i.Name.ToString()) + _  
                    "/@" + att.Name.ToString())  
        End If  
    Next  
    For Each child As XElement In el.Elements()  
        DumpInvalidNodes(child)  
    Next  
End Sub  
  
Dim errors As Boolean = False  
  
Private Sub XSDErrors(ByVal o As Object, ByVal e As ValidationEventArgs)  
    Console.WriteLine("{0}", e.Message)  
    errors = True  
End Sub  
  
Sub Main()  
    Dim xsdMarkup As XDocument = _  
    <?xml version='1.0'?>  
    <xsd:schema xmlns:xsd='http://www.w3.org/2001/XMLSchema'>  
        <xsd:simpleType name='GCType'>  
            <xsd:restriction base='xsd:token'>  
                <xsd:enumeration value='AAA'/>  
                <xsd:enumeration value='BBB'/>  
            </xsd:restriction>  
        </xsd:simpleType>  
        <xsd:element name='Root'>  
            <xsd:complexType>  
                <xsd:sequence>  
                    <xsd:element name='Child1' minOccurs='1' maxOccurs='1'>  
                        <xsd:complexType>  
                            <xsd:sequence>  
                                <xsd:element name='GrandChild1' type='GCType'/>  
                                <xsd:element name='GrandChild2' type='GCType'/>  
                                <xsd:element name='GrandChild3' type='GCType'/>  
                            </xsd:sequence>  
                        </xsd:complexType>  
                    </xsd:element>  
                </xsd:sequence>  
            </xsd:complexType>  
        </xsd:element>  
    </xsd:schema>  
  
    Dim schemas As XmlSchemaSet = New XmlSchemaSet()  
    schemas.Add("", xsdMarkup.CreateReader)  
  
    Dim doc1 As XDocument = _  
    <?xml version='1.0'?>  
    <Root>  
        <Child1>  
            <GrandChild1>AAA</GrandChild1>  
            <GrandChild2>ZZZ</GrandChild2>  
            <GrandChild3>ZZZ</GrandChild3>  
        </Child1>  
    </Root>  
  
    Console.WriteLine("Validating doc1 ...")  
    errors = False  
    doc1.Validate(schemas, AddressOf XSDErrors, True)  
    Console.WriteLine("doc1 {0}", IIf(errors, "did not validate", "validated"))  
    DumpInvalidNodes(doc1.Root)  
End Sub  

This example produces the following output:

Validating doc1 ...  
The 'GrandChild2' element is invalid - The value 'ZZZ' is invalid according to its datatype 'GCType' - The Enumeration constraint failed.  
The 'GrandChild3' element is invalid - The value 'ZZZ' is invalid according to its datatype 'GCType' - The Enumeration constraint failed.  
doc1 did not validate  
Invalid Element /Root  
Invalid Element /Root/Child1  
Invalid Element /Root/Child1/GrandChild2  
Invalid Element /Root/Child1/GrandChild3  

Remarks

You can use the IXmlSchemaInfo returned by this method to determine certain characteristics of a validated element. For example, you can determine the dynamic schema type of the element.

You use the SchemaElement property to get a partial validation type (XmlSchemaElement). You can use it to revalidate a sub-tree with an element at its root without validating an entire document.

For an example of this property, see Validate.

Applies to