10 апреля 2009 | Автор: Admin | Рубрика: Компьютерная литература » Програм-ние и разработка » XML | Комментариев: 0
Timothy Ross, "Xml, Managing Data Exchange"
Global media | 2008 | ISBN: 8189940880 | 325 pages | PDF | 1,9 MB
There are four central problems in data management: capture, storage,
retrieval, and exchange. The purpose of this book is to address XML, a
technology for managing data exchange. The foundational XML chapters in
this book are structured by a ‘data model’ approach. The first chapter
introduces the reader to the XML document, XML schema, and XML
stylesheet with a single entity example. Subsequent chapters expand upon
the XML basics with multiple-entity examples and a one-to-one relationship,
a one-to-many relationship, or a many-to-many relationship.
XML is a tool used for data exchange. Data exchange has long been an issue
in information technology, but the Internet has elevated its importance.
Electronic data interchange (EDI), the traditional data exchange standard for
large organizations, is giving way to XML, which is likely to become the data
exchange standard for all organizations, irrespective of size.
EDI supports the electronic exchange of standard business documents and is
currently the major data format for electronic commerce. A structured format
is used to exchange common business documents (e.g., invoices and
shipping orders) between trading partners. In contrast to the free form of email
messages, EDI supports the exchange of repetitive, routine business
transactions. Standards mean that routine electronic transactions can be
concise and precise. The main standard used in the United States and
Canada is known as X.12, and the major international standard is
UN/EDIFACT. Firms adhering to the same standard can share data
The Internet is a global network potentially accessible by nearly every firm,
with communication costs typically less than those of traditional EDI.
Consequently, the Internet has become the electronic transport path of
choice between trading partners. The simplest approach is to use the
Internet as a means of transporting EDI documents. But because EDI was
developed in the 1960s, another approach is to reexamine the technology of
data exchange. A result of this rethinking is XML, but before considering XML
we need to learn about SGML, the parent of XML.
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