Information Technology Reference
In-Depth Information
Retrieval Request
Relational-XML
Connectivity Machine
Query
Interpreter
Relational
Database
Object
Composer
Data Map
Schemas
XML-to-Relational
Relational-to-XML
XML Document
Fig. 1.9
Relational-XML connectivity machine
To convert a relational database into an XML document and vice versa, we apply
a Relational XML Connectivity Machine using an XML document for informa-
tion exchange standard on the Internet for B2B (business-to-business) applications.
The Data Map schema files consist of relational schema and corresponding XML
schema. The company relational database consists of seller/buyer databases. The
XML document is for the information exchange on the Internet in Fig.
1.9
.
1.7
Summary
The evolution of information system technologies started with file systems in the
1960s, database system in the 1970s, and ESs in the 1980s. The need to upgrade a
company's information system is vital to its success. Database technologies offer
a solution for a company's organization to share information efficiently and ef-
fectively. ESs provide important information for management decision-making. To
protect a company's huge investment in the information system, reengineering rath-
er than rewriting seems to be more cost-effective. Information engineering includes
database reengineering and ES reengineering. The former can be accomplished by
upgrading an obsolete record-based hierarchical or network database into a relation-
based relational, or reengineering a relational database into an object-based object-
oriented, or Internet-based XML. The upgrade (conversion) process includes sche-
ma translation, data conversion, and program translation. The aspect of reengineer-
ing an existing database system into an object-oriented or XML system is also very
attractive due to the increase of productivity and user friendliness of object-oriented
systems, and the importance of Internet application of XML systems. Data integra-
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