With a string-to-lexia link it is not possible to reference to a certain part of a file. This kind of link can make hypermedia easily navigable, especially if the destination nodes are "short" documents. String-to-string links would permit the destination to be a string in a file, but this kind of link requires more planning in the design process.
String-to-lexia links also support implicit linking. Implicit links are generated by the hypermedia software on runtime, for example referential links from a concept to the definition of the concept. To some extent hypermedia software should generate links from the fluctuated forms of concepts (a link from word "matrix" and "matrices"). In contrast to implicit links, explicit links are generated by the hypermedia author.
The nodes and links form a network structure in the database. Hypermedia is a database which contains pictures, digitised videos, sound and animations in addition to text.
More definitions of Hypertext Terms are available on WWW itself.