Information Technology Reference
In-Depth Information
Buyer
Database
XML-to-Relational
Data Convervsion
Data Extraction
Relational-to-XML
Data Convervsion
Data Extraction
XMLRT
Internet
XMLDocument
Knowledge-
Base Repository
Classification
Table
Relational-to-XML
Data Convervsion
Data Extraction
XML-to-Relational
Data Convervsion
Data Extraction
Seller
Database
Fig. 1.8
Architecture of XML receiver transmitter
Using an XMLRT system with XML document, we can enrich data portability
and application access on the Internet more efficiently than ever before. XMLRT
and XML documents allow a company to realize long-term benefits via improved
feasibility in the market. We also bring information into any Web browser anywhere
in the world. By providing an information highway on the Internet, an XML docu-
ment is made to suit a company's inter-company and self-defined requirements for
data exchange. The tasks involved are: (1) Select and map a view of sender's rela-
tional database into different topological XML documents. (2) Integrate the trans-
lated topological XML documents into one. (3) Translate the XML document to
receiver's relational database for storage.
To make relational tables compatible with the XML document, we join the
former into a single relation, and transfer the joined relational schema into XML
schema. We load tuples of the joined relation into object instances of elements or
attributes in the XML document according to the XML schema, and preserve their
data dependencies.
To receive an XML document from the Internet, we need an XML-to-Relational
Connectivity Machine. This machine maps an XML schema into a relational schema.
By traversing the XML document from Root to all element instances, it loads XML
instances into tuples in relations with
OID
(object identity). The Data Map schemas
consist of relational schemas and their corresponding XML schemas. The company
relational database consists of seller and buyer databases (Fong and Wong
2004
).
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