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# Input and Output Options

Input and output options specifically intended for `NSXMLDocument` objects.

## Discussion

Because `NSXMLDocument` is a subclass of [`XMLNode`](/documentation/Foundation/XMLNode), you can also use the relevant input and output options described in Constants in the `NSXMLNode` class reference. You can specify input options in the `NSXMLDocument` methods [`init(contentsOf:options:)`](/documentation/Foundation/XMLDocument/init(contentsOf:options:)), [`init(data:options:)`](/documentation/Foundation/XMLDocument/init(data:options:)), [`init(xmlString:options:)`](/documentation/Foundation/XMLDocument/init(xmlString:options:)-65m2r). The [`xmlData(options:)`](/documentation/Foundation/XMLDocument/xmlData(options:)) method takes output options.

## Topics

### Constants

[`static var documentTidyHTML: XMLNode.Options`](/documentation/Foundation/XMLNode/Options/documentTidyHTML)

Formats HTML into valid XHTML during processing of the document.

[`static var documentTidyXML: XMLNode.Options`](/documentation/Foundation/XMLNode/Options/documentTidyXML)

Changes malformed XML into valid XML during processing of the document.

[`static var documentValidate: XMLNode.Options`](/documentation/Foundation/XMLNode/Options/documentValidate)

Validates this document against its DTD (internal or external) or XML Schema.

[`static var documentXInclude: XMLNode.Options`](/documentation/Foundation/XMLNode/Options/documentXInclude)

Replaces all XInclude nodes in the document with the nodes referred to.

[`static var documentIncludeContentTypeDeclaration: XMLNode.Options`](/documentation/Foundation/XMLNode/Options/documentIncludeContentTypeDeclaration)

Includes a content type declaration for HTML or XHTML in the output of the document.


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