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performance overhead of this translation can be very substantial, and it remains to be seen how popular these capabilities will be in practice. However, if an application is handling external data in XML form, the translation between XML and SQL data must occur at some point, and translation within the DBMS itself may be the most efficient approach.

Relationships are the associations among relational database tables. While each relational table can stand alone, databases are all about storing related data. For example, you can store information about categories used by the video store to organize the inventory of movies in addition to the movies themselves. At the same time, you can store information about the copies of each video you have in the video store, including the date the copy was acquired and the format of the copy (DVD or VHS). By using relationships, you can tie the related tables together in a formal way that is easy to use when you want to combine data from multiple tables in the same database query but with the exibility to include only the information of interest. This ability to pick and choose the information you want from the database allows you to tailor the information in the database to the speci c needs of each individual or application that accesses the database. Figure 1-2 shows four tables from the video store database and the relationships among them in a format known as an Entity Relationship Diagram (ERD). ERDs provide an easy medium for showing the overall design of a relational database and are easily understood by both technical and nontechnical database users. Each rectangle in the diagram represents a relational table, with the name of the table

One of the most powerful qualities of the relational model is its very rigid support for data types and data structure, implemented by the definitions of tables, columns, primary keys, foreign keys, and constraints. In addition, as shown in 16, the system catalog of a relational database contains metadata, or data about the data in the database. By querying the system catalog, you can discover the structure of the database, including the data types of its columns, the columns that comprise its tables, and intratable relationships. In contrast, XML documents by themselves provide only very limited metadata. They impose a hierarchical element structure on their data, but the only real data about the structure is the names of the elements and attributes. An XML document can be well formed and still have quite an irregular structure. For example, there is nothing to

prevent a well-formed XML document from having a named element that contains text data in one instance and subelements in another instance, or a named attribute that has an integer value for one element and a date value for another Clearly, a document with this structure, while it may be well formed, does not represent data that is easily transformed to and from a relational database When using XML for data processing documents, stronger support for data types and rigid structure is needed XML standards and products have addressed this need in multiple ways during the short history of XML technologies These include: I Document Type Definition (DTD) A part of the original XML 10 specification, Document Type Definitions provided a way to specify and restrict the structure of a document.

XML parsers can examine an XML document in the context of a DTD and determine whether it is a valid document (ie, whether it conforms to the DTD restrictions) I XML-Data Submitted to the W3C in 1998, XML-Data was an early attempt to address some of the deficiencies in the DTD scheme It never received W3C endorsement, but many of its ideas have carried forward into the XML Schema specification Microsoft adapted its own form of XML-Data, called XML-Data Reduced (XDR), and implemented it as part of its BizTalk integration server and Internet Explorer 50 browser The energy around the XML-Data proposal shifted in late 1999 and 2000 to the XML Schema proposal I XML Schema A stand-alone specification that became a W3C recommendation in May 2001, XML Schema built on and extended the ideas in XML-Data.