Out-of-line links
It is often neater to separate an extended link from all of the resources it identifies. An out-of-line link is simply a link that has no local resource. While an out-of-line link may physically appear in-line, in the sense that it can be placed in the flow of text, this has no significance, and only makes the linking mechanism more difficult to find and maintain. A more obvious place to put out-of-line links is at the top of the document:
It is important to note that some documents may not contain any information on the resources they hold, as in 'document 2' in the example above, because their linked resources are identified ...
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