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# init(data:options:)

Initializes and returns an `NSXMLDocument` object created from an [`NSData`](/documentation/Foundation/NSData) object.

```
init(data: Data, options mask: XMLNode.Options = []) throws
```

## Parameters

`data`

A data object with XML content.

`mask`

A bit mask for input options. You can specify multiple options by bit-OR’ing them. See Constants for a list of valid input options.

## Return Value

An initialized `NSXMLDocument` object, or  `nil` if initialization fails because of parsing errors or other reasons.

## Discussion

This method is the designated initializer for the `NSXMLDocument` class.

If you specify `NSXMLDocumentTidyXML` as one of the options, NSXMLDocument performs several clean-up operations on the document XML (such as removing leading tabs). It does respect the `xml:space="preserve"` attribute when it attempts to tidy the XML.

> Handling Errors in Swift:
> In Swift, this API is imported as an initializer and is marked with the `throws` keyword to indicate that it throws an error in cases of failure.
> 
> You call this method in a `try` expression and handle any errors in the `catch` clauses of a `do` statement, as described in [Error Handling](https://docs.swift.org/swift-book/LanguageGuide/ErrorHandling.html) in [The Swift Programming Language](https://docs.swift.org/swift-book/) and `About Imported Cocoa Error Parameters`.

---

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