static func decodeMarkdown (from: Decoder) -> Self.Value Decodes a value from the provided decoder.
Overview 概要
This protocol is separate from Decodable to separate explicit attributes defined by the SDK from Markdown’s semantic styling attributes. You use these attributes with Apple’s extended syntax for markdown: ^[text](attribute: value).
Using this protocol allows your markup names to differ from the names of your attributes. For example, the automatic grammar agreement feature uses markup like ^[text to inflect](inflect: true). This feature defines an Attribute that conforms to Markdown. The value of its name proprerty is NSInflect, while its markdown, used in actual Markdown strings like the one shown here, is inflect.
To define your own attributes for use with Markdown syntax, make sure your attributes conform to this protocol. The markdown parser ignores attributes that don’t conform, even if you use the extended Markdown syntax.