Schema: mainContentOfPage
Schema: mainContentOfPage Example Markup
The following are examples of markup written in json+ld that include the correct usage for Schema: mainContentOfPage.
WebPageElement
WebPageElement JSON-LD example for a component of a web page (header, footer, sidebar, ad block). CreativeWork subtype with cssSelector and xpath. Parent of SiteNavigationElement, Table, WPFooter, WPHeader, WPSideBar, WPAdBlock.