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Specific features missing from HTML
- HTML does not provide a way to validate document data structures
or impose editorial control in projects with multiple authors
- It is difficult or impossible in the general case to reliably
generate navigational aids from HTML documents
- As a result, navigation usually has to be implemented by adding
handcrafted hypertext links
- HTML browsers have no concept of entity management (no mechanism
for modular reuse)
- With just a general-purpose tag set, context searching or other
behavior based on semantic distinctions is difficult or impossible
- HTML cannot easily be made to model data structures residing in
databases
HTML is not the optimum data format for database interchange or
certain kinds of large-scale commercial publishing.