DocumentFragment
public final class DocumentFragment: DictionaryFragmentDocumentFragment provides access to a document object. DocumentFragment also provides subscript access by either key or index to the data values of the document which are wrapped by Fragment objects.
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                  Checks whether the document exists in the database or not. DeclarationSwift public var exists: Bool
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                  Gets the document from the document fragment object. DeclarationSwift public var document: Document?
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                  Subscript access to a Fragment object by the given key. DeclarationSwift public subscript(key: String) -> FragmentParameterskeyThe key. 
 DocumentFragment Class Reference
        DocumentFragment Class Reference