Identifying nodes and links and classifying them into various types (to capture semantics)

An important problem related to this issue is called the fragmentation problem. It is still difficult to identify text units that can be separate modules and also serve as cross-references for other entries. Links should follow some model of the user's need for information in some particular context. Deciding on the level of granularity is a difficult problem. Too fine the granularity, greater the problem of fragmentation. Too coarse the granularity, greater the need or the display of large entries.

Also fragmentation tends to make an implicit structure (such as a subtle treatment of a theme that may communicate an idea more artistically) explicit, taking away the expressiveness of the statement. Therefore, we have to find means to reduce segmentation of ideas and loss of structural information due to the manipulation of the semantic structure of a linear document.