/**
* Defines a **Content Item** in the CMS
* @typedef ContentItem
* @memberof AgilityFetch.Types
* @property {number} contentID - The unique ID of the content item in this language.
* @property {AgilityFetch.Types.SystemProperties} properties - The system properties of the content item.
* @property {Object} fields - A dictionary of the fields and the values of the content item.
* @property {Object} [seo] - Any SEO related fields for the content item. This is only returned for Dynamic Page Items.
*/