A place holder for the legacy file id. This is eliminated after the link has been properly resolved.

When this attribute has an associated data-legacy-file-id and data-legacy-para-id with it the link has not yet been resolved. When it is by itself the link has been resolved but the document it is pointing to has not yet been approved for publishing so the href value is being protected and the link neutralized until the companion document is published.

A place holder for the legacy para id. This is eliminated after the link has been properly resolved.

"property-name" — adds a property to a microdata item. The name of the property can be a word or URL, and the value is the ‘content’ of the element with this attribute.

Defines a group of name-value pair(s), called an item

defines the item’s type when used on the same element as itemscope. The itemtype value is a URL that acts as an identifying vocabulary name.