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Abstract : |
Adatamodel and query language for accessing structured documents expressed in SGML is presented. The ELF (ELements with Features) model uses the SGML grammar (DTD) directly as a schema avoiding transformations which can lose information. The model also gives exibility to the implementor to retrieve whole documents and decompose them, retrieve atomic elements and recombine them, or pursue alternatives which retrieve the elements directly. The language, Structured Generalized Query Language (SGQL), allows e cient access to the content, structure and attributes of documents at any level within their structure. This is all achieved with a simple, largely orthogonal functional language. 1 Introduction and, |
