The data-aid attribute specifies its element's annotation unique identifier.

This attribute is used to identify content that is intended for a particular audience.

During the digital production process for ldsXML there was style information added downstream. During the schemas development the working group has explicitly chosen not to add style information to the content, instead they are relying on semantic based values. This attribute will temporarily store those values. The reason for doing this it keep these values close at hand for a season just in case we need it during the migration period. It is intended to be deprecated from the content and the schema as soon as it is prudent.

For use in notifying downstream publishing channels if there is content that is specific for their channel.

This attribute has a defined list of values, which include definitions that represent instructions for supplying content to translation services. This attribute should only be used if some sort of pre-processing is necessary to support translation of the content.

"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.