XMLizer 2.0
XMLizer carries out the transformation from XML documents
to existing relational databases and vice-versa.The
XMLizer permits XQuery based extraction of data from a relational
database, the transformation
of XML to XML formats and the insertion (or loading) of the XML data
into relational database tables.
The XML/DBC Java API for XML Mediators, Repositories and ELT Tools
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for a brochure describing the XMLizer. (PDF 32
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for answers to Frequently Asked Questions (FAQ) on the XMLizer. (PDF 30
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for a 30 day evaluation version of the XMLizer.
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All data translation is simplified into a single document.
Thus, the unique properties of this tool are:
- Drastically reduced development time. The programmer
simply defines the mappings and all generation of identifiers,
parsing of documents and generation of complex SQL statements
are done automatically.
- Increased ease of maintainence. Translations between XML and SQL
are no longer cast in the "stone" of programs. The
translations are clearly laid
out in a single location providing a clear description of data
movement in both directions.
- Increased performance. XMLizer is highly optimized to
perform these translations. Instead of "one-off"
optimizations used in an ad-hoc translation, all
optimization techniques are gathered in one place and can be
applied to all uses of the product.
Exchanging data between EAI, EDI or B to B platforms and an
existing relational database is difficult due to the
differences in the structure and type of the data involved.
The XMLizer brings a solution to this problem by providing a
tool to easily:
This functionality is provided by the component with a
maximum of flexibility and openness to incremental
improvements.
Extractor
For each type of XML document to be produced,
the developer forms the XQuery requests that permit the
extraction of data to be linked to the XML document.
The extractor module itself is in charge of the
connection to the relational database, the execution of
the XQuery requests, and the reconstruction of the XML
documents in the specified format.
The Extractor provides a wide range of flexibility for:
- Defining generic requests containing parameters
that are instantiated at run-time,
- Defining a nested set of requests to construct
deeply structured XML documents from a flat
relational schema,
- Choosing the format of the XML document to be
generated.
The following diagram shows the architecture of the Extractor:
Mapper
For each type of XML document to be inserted, the developer
forms a set of storage rules to be applied to the elements of
the document. These rules are specified with the aide of the
a simple mapping language. The Mapper utilizes these
rules to decide where data elements are stored. Restrictions
on data storage (such as foreign keys) are automatically
handled during data storage.
The essential functionality provided is:
- Control of the structure of the documents accepted,
- Management of data integrity constraints,
- Conditional insertion and updates on the database,
- Integration of function calls and SQL requests
during insertion,
- Automatic generation of identifiers and keys,
- User defined generation of identifiers and keys, and
- Execution of related stored procedures.
The following diagram shows the architecture of the Mapper:
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