Complex requirements
Stylesheet languages that deal only with straightforward textual concepts such as headers, paragraphs and lists can be complex enough, but long experience with SGML-based publishing systems has shown just how demanding the formatting task becomes when tables, graphics and mathematical formulae are also involved.
Tables
Tables are complex because they are divided into smaller components that do not follow a simple linear sequence; including rows, columns and cells. Rendering software needs to know which elements play specific roles in the structure of the table, and which attributes specify such things as column widths, text alignment within columns and individual cells, and cells that span across or down into adjacent cell ...
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