<http://schema.org/relatedLink>
<https://en-us.help.blackboard.com/Learn/Instructor/Course_Content/Content_Collection/Organize_and_Manage/How_Content_Collection_Links_Behave>
<https://en-us.help.blackboard.com/Learn/Instructor/Course_Content/Content_Collection/Organize_and_Manage/Metadata/Metadata_Attributes_and_Templates>