9.4. Detailed Design Descriptions
In this section we explore three aspects of the prototype in some detail: the object-relational DBMS schema used to hold the XML document schemas and data, the user-defined types needed to make hierarchical operations efficient, and the algorithms used to map XPath expressions to their corresponding SQL-3 queries.
Figure 9.3 presents the basic schema used in the prototype in an entity-relationship diagram, and Listing 9.3 shows the required SQL-3 DDL (Data Definition Language). What Figure 9.3 conveys can be thought of as a design pattern, rather than a complete schema. Because the prototype generates all of its SQL at runtime, it has considerable flexibility in terms of how it uses the table and schema management ...
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