Designing data-intensive Web applications by Stefano Ceri; et al

By Stefano Ceri; et al

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Client-side scripting is particularly useful in conjunction with the

tag, an HTML element for constructing data entry forms. In this case, events can be attached to the form fields and may trigger functions for validating the user input, for example, for controlling the validity of a date. 1. 4 Client-Side Components for Enhancing Client Functionality Client-side scripting is not the only way to add interactive functions to an HTML page. A more powerful feature is offered by client-side components, which are executable objects plugged into the page.

New York NY 3 Widget Inc. 5 Third Av. S. Francisco CA 4 Supply Inc. 8 Fifth Rd. 15 ADDRESS Tables in a relational database. 16 Table storing purchases of products performed by customers. column, and the key of table customer is the ID column. 15 to denote that they are the key of the respective table. The notion of key is central in relational databases, because it permits the expression of semantic relationships between the objects of the application domain. 16. Each row in the table specifies the product (PROD-CODE), the 34 Chapter One: Technologies for Web Applications customer (CUST-ID), and the total purchased quantity (QUANTITY).

The default values of the occurrence indicators are 1. Elements chapter, title, editor, and author (declared at lines 21–24) are of type string, one of the basic types provided by XML schema, which also includes the decimal, integer, Boolean, date, and time types. Element part (lines 27–31) may contain both plain text and chapter elements: this feature is specified by setting the mixed attribute to true (line 27), and by defining the nontextual subelement of part (lines 28–30). Finally, element publishing (lines 33–47) has empty content and three attributes.

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