Quote object definition doesn't fully support the needs in HTML

[rdsaunders]

I'm concerned that the quote object definition doesn't fully support the needs in HTML.

Current

{
  "type": "_quote",
  "id": "gOZ4Mg", // Hashed GUID
  "value": "Stay hungry, stay foolish",
  "properties": {
      "source": "Steve Jobs",
      "citation": "https://www.apple.com/stevejobs/"
   }
}

The value is correct and would largely represent a <blockquote> in HTML.

The source property has previously been used to represent the person that made the quote; this would usually be placed in a figcaption element below the blockquote.

However, citations fall into two parts a cite attribute which applies to the Blockquote, e.g.<blockquote cite="https://youtu.be/UF8uR6Z6KLc">Stay hungry stay foolish</blockquote> and the <cite> element for referencing the creative work.

e.g.

<figure>
<blockquote cite="{{url: https://youtu.be/UF8uR6Z6KLc}}">{{value: Stay hungry, stay foolish}}</blockquote>
<figcaption>{{source: Steve Jobs}} <cite>{{citation: Steve Jobs' 2005 Stanford Commencement Address}}</cite></figcaption>
</figure>

For that, reason I think we need to update the quote definition:
Addition of a URL property.

{
  "type": "_quote",
  "id": "gOZ4Mg", // Hashed GUID
  "value": "Stay hungry, stay foolish",
  "properties": {
      "source": "Steve Jobs",  
      "url": "https://youtu.be/UF8uR6Z6KLc"
      "citation": "Steve Jobs' 2005 Stanford Commencement Address"
   }
}