System.Xml.Schema Namespace

Contains the XML classes that provide standards-based support for XML schema definition language (XSD) schemas.

Classes

Extensions	This class contains the LINQ to XML extension methods for XSD validation.
ValidationEventArgs	Returns detailed information related to the ValidationEventHandler.
XmlAtomicValue	Represents the typed value of a validated XML element or attribute. The XmlAtomicValue class cannot be inherited.
XmlSchema	An in-memory representation of an XML Schema, as specified in the World Wide Web Consortium (W3C) XML Schema Part 1: Structures and XML Schema Part 2: Datatypes].
XmlSchemaAll	Represents the World Wide Web Consortium (W3C) all element (compositor).
XmlSchemaAnnotated	The base class for any element that can contain annotation elements.
XmlSchemaAnnotation	Represents the World Wide Web Consortium (W3C) annotation element.
XmlSchemaAny	Represents the World Wide Web Consortium (W3C) any element.
XmlSchemaAnyAttribute	Represents the World Wide Web Consortium (W3C) anyAttribute element.
XmlSchemaAppInfo	Represents the World Wide Web Consortium (W3C) appinfo element.
XmlSchemaAttribute	Represents the attribute element from the XML Schema as specified by the World Wide Web Consortium (W3C). Attributes provide additional information for other document elements. The attribute tag is nested between the tags of a document's element for the schema. The XML document displays attributes as named items in the opening tag of an element.
XmlSchemaAttributeGroup	Represents the attributeGroup element from the XML Schema as specified by the World Wide Web Consortium (W3C). AttributesGroups provides a mechanism to group a set of attribute declarations so that they can be incorporated as a group into complex type definitions.
XmlSchemaAttributeGroupRef	Represents the attributeGroup element with the ref attribute from the XML Schema as specified by the World Wide Web Consortium (W3C). AttributesGroupRef is the reference for an attributeGroup, name property contains the attribute group being referenced.
XmlSchemaChoice	Represents the choice element (compositor) from the XML Schema as specified by the World Wide Web Consortium (W3C). The choice allows only one of its children to appear in an instance.
XmlSchemaCollection	Contains a cache of XML Schema definition language (XSD) and XML-Data Reduced (XDR) schemas. The XmlSchemaCollection class is obsolete. Use XmlSchemaSet instead.
XmlSchemaCollectionEnumerator	Supports a simple iteration over a collection. This class cannot be inherited.
XmlSchemaCompilationSettings	Provides schema compilation options for the XmlSchemaSet class This class cannot be inherited.
XmlSchemaComplexContent	Represents the complexContent element from XML Schema as specified by the World Wide Web Consortium (W3C). This class represents the complex content model for complex types. It contains extensions or restrictions on a complex type that has either only elements or mixed content.
XmlSchemaComplexContentExtension	Represents the extension element from XML Schema as specified by the World Wide Web Consortium (W3C). This class is for complex types with complex content model derived by extension. It extends the complex type by adding attributes or elements.
XmlSchemaComplexContentRestriction	Represents the restriction element from XML Schema as specified by the World Wide Web Consortium (W3C). This class is for complex types with a complex content model derived by restriction. It restricts the contents of the complex type to a subset of the inherited complex type.
XmlSchemaComplexType	Represents the complexType element from XML Schema as specified by the World Wide Web Consortium (W3C). This class defines a complex type that determines the set of attributes and content of an element.
XmlSchemaContent	An abstract class for schema content.
XmlSchemaContentModel	Specifies the order and structure of the child elements of a type.
XmlSchemaDatatype	The XmlSchemaDatatype class is an abstract class for mapping XML Schema definition language (XSD) types to Common Language Runtime (CLR) types.
XmlSchemaDocumentation	Represents the documentation element from XML Schema as specified by the World Wide Web Consortium (W3C). This class specifies information to be read or used by humans within an annotation.
XmlSchemaElement	Represents the element element from XML Schema as specified by the World Wide Web Consortium (W3C). This class is the base class for all particle types and is used to describe an element in an XML document.
XmlSchemaEnumerationFacet	Represents the enumeration facet from XML Schema as specified by the World Wide Web Consortium (W3C). This class specifies a list of valid values for a simpleType element. Declaration is contained within a restriction declaration.
XmlSchemaException	Returns detailed information about the schema exception.
XmlSchemaExternal	An abstract class. Provides information about the included schema.
XmlSchemaFacet	Abstract class for all facets that are used when simple types are derived by restriction.
XmlSchemaFractionDigitsFacet	Specifies a restriction on the number of digits that can be entered for the fraction value of a simpleType element. The value of fractionDigits must be a positive integer. Represents the World Wide Web Consortium (W3C) fractionDigits facet.
XmlSchemaGroup	Represents the group element from XML Schema as specified by the World Wide Web Consortium (W3C). This class defines groups at the schema level that are referenced from the complex types. It groups a set of element declarations so that they can be incorporated as a group into complex type definitions.
XmlSchemaGroupBase	An abstract class for XmlSchemaAll, XmlSchemaChoice, or XmlSchemaSequence.
XmlSchemaGroupRef	Represents the group element with ref attribute from the XML Schema as specified by the World Wide Web Consortium (W3C). This class is used within complex types that reference a group defined at the schema level.
XmlSchemaIdentityConstraint	Class for the identity constraints: key, keyref, and unique elements.
XmlSchemaImport	Represents the import element from XML Schema as specified by the World Wide Web Consortium (W3C). This class is used to import schema components from other schemas.
XmlSchemaInclude	Represents the include element from XML Schema as specified by the World Wide Web Consortium (W3C). This class is used to include declarations and definitions from an external schema. The included declarations and definitions are then available for processing in the containing schema.
XmlSchemaInference	Infers an XML Schema Definition Language (XSD) schema from an XML document. The XmlSchemaInference class cannot be inherited.
XmlSchemaInferenceException	Returns information about errors encountered by the XmlSchemaInference class while inferring a schema from an XML document.
XmlSchemaInfo	Represents the post-schema-validation infoset of a validated XML node.
XmlSchemaKey	This class represents the key element from XMLSchema as specified by the World Wide Web Consortium (W3C).
XmlSchemaKeyref	This class represents the keyref element from XMLSchema as specified by the World Wide Web Consortium (W3C).
XmlSchemaLengthFacet	Represents the length facet from XML Schema as specified by the World Wide Web Consortium (W3C). This class can be used to specify a restriction on the length of a simpleType element on the data type.
XmlSchemaMaxExclusiveFacet	Represents the maxExclusive element from XML Schema as specified by the World Wide Web Consortium (W3C). This class can be used to specify a restriction on the maximum value of a simpleType element. The element value must be less than the value of the maxExclusive element.
XmlSchemaMaxInclusiveFacet	Represents the maxInclusive element from XML Schema as specified by the World Wide Web Consortium (W3C). This class can be used to specify a restriction on the maximum value of a simpleType element. The element value must be less than or equal to the value of the maxInclusive element.
XmlSchemaMaxLengthFacet	Represents the maxLength element from XML Schema as specified by the World Wide Web Consortium (W3C). This class can be used to specify a restriction on the maximum length of the data value of a simpleType element. The length must be less than the value of the maxLength element.
XmlSchemaMinExclusiveFacet	Represents the minExclusive element from XML Schema as specified by the World Wide Web Consortium (W3C). This class can be used to specify a restriction on the minimum value of a simpleType element. The element value must be greater than the value of the minExclusive element.
XmlSchemaMinInclusiveFacet	Represents the minInclusive element from XML Schema as specified by the World Wide Web Consortium (W3C). This class can be used to specify a restriction on the minimum value of a simpleType element. The element value must be greater than or equal to the value of the minInclusive element.
XmlSchemaMinLengthFacet	Represents the minLength element from XML Schema as specified by the World Wide Web Consortium (W3C). This class can be used to specify a restriction on the minimum length of the data value of a simpleType element. The length must be greater than the value of the minLength element.
XmlSchemaNotation	Represents the notation element from XML Schema as specified by the World Wide Web Consortium (W3C). An XML Schema notation declaration is a reconstruction of XML 1.0 NOTATION declarations. The purpose of notations is to describe the format of non-XML data within an XML document.
XmlSchemaNumericFacet	Abstract class for defining numeric facets. This class is the base class for numeric facet classes such as XmlSchemaMinLengthFacet.
XmlSchemaObject	Represents the root class for the Xml schema object model hierarchy and serves as a base class for classes such as the XmlSchema class.
XmlSchemaObjectCollection	A collection of XmlSchemaObjects.
XmlSchemaObjectEnumerator	Represents the enumerator for the XmlSchemaObjectCollection.
XmlSchemaObjectTable	Provides the collections for contained elements in the XmlSchema class (for example, Attributes, AttributeGroups, Elements, and so on).
XmlSchemaParticle	Abstract class for that is the base class for all particle types (e.g. XmlSchemaAny).
XmlSchemaPatternFacet	Represents the pattern element from XML Schema as specified by the World Wide Web Consortium (W3C). This class can be used to specify a restriction on the value entered for a simpleType element.
XmlSchemaRedefine	Represents the redefine element from XML Schema as specified by the World Wide Web Consortium (W3C). This class can be used to allow simple and complex types, groups and attribute groups from external schema files to be redefined in the current schema. This class can also be used to provide versioning for the schema elements.
XmlSchemaSequence	Represents the sequence element (compositor) from the XML Schema as specified by the World Wide Web Consortium (W3C). The sequence requires the elements in the group to appear in the specified sequence within the containing element.
XmlSchemaSet	Contains a cache of XML Schema definition language (XSD) schemas.
XmlSchemaSimpleContent	Represents the simpleContent element from XML Schema as specified by the World Wide Web Consortium (W3C). This class is for simple and complex types with simple content model.
XmlSchemaSimpleContentExtension	Represents the extension element for simple content from XML Schema as specified by the World Wide Web Consortium (W3C). This class can be used to derive simple types by extension. Such derivations are used to extend the simple type content of the element by adding attributes.
XmlSchemaSimpleContentRestriction	Represents the restriction element for simple content from XML Schema as specified by the World Wide Web Consortium (W3C). This class can be used to derive simple types by restriction. Such derivations can be used to restrict the range of values for the element to a subset of the values specified in the inherited simple type.
XmlSchemaSimpleType	Represents the simpleType element for simple content from XML Schema as specified by the World Wide Web Consortium (W3C). This class defines a simple type. Simple types can specify information and constraints for the value of attributes or elements with text-only content.
XmlSchemaSimpleTypeContent	Abstract class for simple type content classes.
XmlSchemaSimpleTypeList	Represents the list element from XML Schema as specified by the World Wide Web Consortium (W3C). This class can be used to define a simpleType element as a list of values of a specified data type.
XmlSchemaSimpleTypeRestriction	Represents the restriction element for simple types from XML Schema as specified by the World Wide Web Consortium (W3C). This class can be used restricting simpleType element.
XmlSchemaSimpleTypeUnion	Represents the union element for simple types from XML Schema as specified by the World Wide Web Consortium (W3C). A union datatype can be used to specify the content of a simpleType. The value of the simpleType element must be any one of a set of alternative datatypes specified in the union. Union types are always derived types and must comprise at least two alternative datatypes.
XmlSchemaTotalDigitsFacet	Represents the totalDigits facet from XML Schema as specified by the World Wide Web Consortium (W3C). This class can be used to specify a restriction on the number of digits that can be entered for the value of a simpleType element. That value of totalDigits must be a positive integer.
XmlSchemaType	The base class for all simple types and complex types.
XmlSchemaUnique	Represents the unique element from XML Schema as specified by the World Wide Web Consortium (W3C). This class can be used to identify a unique constraint among a set of elements.
XmlSchemaValidationException	Represents the exception thrown when XML Schema Definition Language (XSD) schema validation errors and warnings are encountered in an XML document being validated.
XmlSchemaValidator	Represents an XML Schema Definition Language (XSD) Schema validation engine. The XmlSchemaValidator class cannot be inherited.
XmlSchemaWhiteSpaceFacet	Represents the World Wide Web Consortium (W3C) whiteSpace facet.
XmlSchemaXPath	Represents the World Wide Web Consortium (W3C) selector element.

Interfaces

IXmlSchemaInfo

Defines the post-schema-validation infoset of a validated XML node.

Enums

XmlSchemaContentProcessing	Provides information about the validation mode of any and anyAttribute element replacements.
XmlSchemaContentType	Enumerations for the content model of the complex type. This represents the content in the post-schema-validation information set (infoset).
XmlSchemaDatatypeVariety	Specifies the W3C XML schema data type variety of the type.
XmlSchemaDerivationMethod	Provides different methods for preventing derivation.
XmlSchemaForm	Indicates if attributes or elements need to be qualified with a namespace prefix.
XmlSchemaInference.InferenceOption	Affects occurrence and type information inferred by the XmlSchemaInference class for elements and attributes in an XML document.
XmlSchemaUse	Indicator of how the attribute is used.
XmlSchemaValidationFlags	Specifies schema validation options used by the XmlSchemaValidator and XmlReader classes.
XmlSchemaValidity	Represents the validity of an XML item validated by the XmlSchemaValidator class.
XmlSeverityType	Represents the severity of the validation event.
XmlTypeCode	Represents the W3C XML Schema Definition Language (XSD) schema types.

Delegates

ValidationEventHandler	Represents the callback method that will handle XML schema validation events and the ValidationEventArgs.
XmlValueGetter	A delegate used by the XmlSchemaValidator class to pass attribute, text, and white space values as a Common Language Runtime (CLR) type compatible with the XML Schema Definition Language (XSD) type of the attribute, text, or white space.

Remarks

Important

• Do not use schemas from unknown or untrusted sources or locations. Doing so will compromise the security of your code.
• XML schemas (including inline schemas) are inherently vulnerable to denial of service attacks; do not accept them in untrusted scenarios.
• Schema validation error messages and exceptions may expose sensitive information about the content model or URI paths to the schema file. Be careful not to expose this information to untrusted callers.
• Additional security considerations are covered in the Remarks section of the APIs in this namespace.

See also

• Working with XML Schemas