The source of the link, that is the blue underlined text, is included inside the A element that defines the link.
Most simple links are inline.
Instead, the links are stored in a separate document called the linkbase . Out of line links allow you to add links to and from documents that can't be modified such as a page on someone else's web site. Out of line links allow you to add links to different parts of non-XML content. Out of line links are not yet supported by software.