let downView = try? DownView(frame: self.view.bounds, markdownString: "**Oh Hai**") {
    // Optional callback for loading finished
}
// Now add to view or constrain w/ Autolayout
// Or you could optionally update the contents at some point:
try? downView?.update(markdownString:  "## [Google](https://google.com)") {
    // Optional callback for loading finished
}

let down = Down(markdownString: "## [Down](https://github.com/iwasrobbed/Down)")

// Convert to HTML
let html = try? down.toHTML()
// "<h2><a href=\"https://github.com/iwasrobbed/Down\">Down</a></h2>\n"

// Convert to XML
let xml = try? down.toXML()
// "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<!DOCTYPE document SYSTEM \"CommonMark.dtd\">\n<document xmlns=\"http://commonmark.org/xml/1.0\">\n  <heading level=\"2\">\n    <link destination=\"https://github.com/iwasrobbed/Down\" title=\"\">\n      <text>Down</text>\n    </link>\n  </heading>\n</document>\n"

// Convert to groff man
let man = try? down.toGroff()
// ".SS\nDown (https://github.com/iwasrobbed/Down)\n"

// Convert to LaTeX
let latex = try? down.toLaTeX()
// "\\subsection{\\href{https://github.com/iwasrobbed/Down}{Down}}\n"

// Convert to CommonMark Markdown
let commonMark = try? down.toCommonMark()
// "## [Down](https://github.com/iwasrobbed/Down)\n"

// Convert to an attributed string
let attributedString = try? down.toAttributedString()
// NSAttributedString representation of the rendered HTML

// Convert to abstract syntax tree
let ast = try? down.toAST()
// Returns pointer to AST that you can manipulate

public struct MarkdownToHTML: DownHTMLRenderable {
    /**
     A string containing CommonMark Markdown
    */
    public var markdownString: String

    /**
     Initializes the container with a CommonMark Markdown string which can then be rendered as HTML using `toHTML()`

     - parameter markdownString: A string containing CommonMark Markdown

     - returns: An instance of Self
     */
    @warn_unused_result
    public init(markdownString: String) {
        self.markdownString = markdownString
    }
}

/**
 Default options
*/
public static let Default = DownOptions(rawValue: 0)

// MARK: - Rendering Options

/**
 Include a `data-sourcepos` attribute on all block elements
*/
public static let SourcePos = DownOptions(rawValue: 1 << 1)

/**
 Render `softbreak` elements as hard line breaks.
*/
public static let HardBreaks = DownOptions(rawValue: 1 << 2)

/**
 Suppress raw HTML and unsafe links (`javascript:`, `vbscript:`,
 `file:`, and `data:`, except for `image/png`, `image/gif`,
 `image/jpeg`, or `image/webp` mime types).  Raw HTML is replaced
 by a placeholder HTML comment. Unsafe links are replaced by
 empty strings.
*/
public static let Safe = DownOptions(rawValue: 1 << 3)

// MARK: - Parsing Options

/**
 Normalize tree by consolidating adjacent text nodes.
*/
public static let Normalize = DownOptions(rawValue: 1 << 4)

/**
 Validate UTF-8 in the input before parsing, replacing illegal
 sequences with the replacement character U+FFFD.
*/
public static let ValidateUTF8 = DownOptions(rawValue: 1 << 5)

/**
 Convert straight quotes to curly, --- to em dashes, -- to en dashes.
*/
public static let Smart = DownOptions(rawValue: 1 << 6)