We introduce the notions of syntactically and semantically structured data to refine the notion of semi-structured data. As we will see, most data found on the Web is syntactically structured. In order to evaluate content-based Web queries, semantically structured data is needed. The problem occurs to transform syntactically structured data into semantically structured data. Syntactically and semantically structured data can be represented by trees. Our main contribution is a powerful restructuring mechanism that allows to express the transformation of trees representing syntactically structured data to trees that represent semantically structured data. We embed our restructuring mechanism into RAW (Relational Algebra for the Web) and demonstrate its expressiveness by several example queries.
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