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XML PIPELINES
USING STYLUS STUDIO

OUTLINES
• Building workflow applications with XML (data integration)
• XPROC the W3C xml pipeline language
• XPROC implementations
• XPROC graphical design tools
• Stylus studio pipeline editor and processor
• XML PIPELINES with stylus studio in details
• Conclusions

BUILDING WORKFLOW APPLICATIONS
WITH XML (BY DR. MICHAEL KAY)
• “XML fits very well with workflow applications, because it's natural to think of
them in terms of documents. In fact, I think it's such a good fit that I think one
should often design an application as an XML-based workflow where we
might have adopted a completely different approach in the past.”
• “Generally when we do the initial modeling for an application we split it into
two parts: the data model and the process model. Sometimes we focus more
on one, sometimes more on the other. One of the difficulties is often in seeing
how the two models relate to each other.”
• “the XML approach to information management is a half-way house between
the rigid discipline of the traditional database approach, and the
uncontrolled chaos of the email-and-spreadsheet culture. But that doesn't
mean it's a messy compromise: on the contrary, I would argue that it gives you
the best of both worlds”

WHAT IS XPROC?
• XProc is an XML Pipeline Language
• XProc enables you to declaratively express the
activities you want to perform on XML documents
• XProc is a W3C recommendation (2010)
• http://www.w3.org/TR/xproc/

BENEFITS OF XPROC?
• XProc takes care of orchestrating all the activities
• XProc is a standard way of expressing processing
activities
• Since an XProc document is an XML document, you
can send it around, transform it, mine it, store it, just
like any other XML document

XPROC USE CASES
• XProc’s goal is to promote an interoperable and
standard approach to the processing of XML
documents. Some of the XPROC Use Cases are
listed below:
• Apply a sequence of operations to XML documents.
• Parse XML, validate it against a schema, and then apply an
XSLT transformation.
• Combine multiple XML documents (document
aggregation).
• Interact with Web services.
• Use metadata retrieval

XPROC PIPELINE EXAMPLE
• The following pipeline
validates the input
against a schema
depending on a version
attribute, then applies
an XSLT.

THE NEED FOR XPROC
• XProc’s declarative format, combined with the simplicity of
thinking in terms of pipelines, will mean that non-technical people
can be involved in writing and maintaining processing workflows.
• XProc, in many configurations, is amenable to streaming, whereas
other approaches to control XML processes are not (for
example, XSLT).
• XProc steps focus on performing specific operations, which over
time should experience greater optimization (in an XProc
processor used by many) versus one-off code that you or I write
(used by few).
• XProc's standard step library and extensibility mechanisms
position XProc to be an all-encompassing solution.
• Structured data (such as XProc markup) is typically easier to reuse
than structured code.
• One of XProc's inspirations is UNIX® pipelines, which hopefully all
can agree is a good thing!

XPROC IMPLEMENTATIONS
• Calabash maintained by Norman Walsh
• Calumet, EMC’s XProc implementation
• QuiXProc, Innovimax's (GPL) version in Java
implementing Streaming and Parallel
processing
• Tubular (LGPL) maintained by Herve Quiroz
• xprocxq, XQuery implementation on top of
eXist

XPROC GRAPHICAL TOOLS
• The EMC XProc Designer is graphical tool for
designing XML Processing pipelines
according to the W3C standard Xproc.

• The stylus studio Pipeline editor

EMC XPROC DESIGNER
• Is a graphical tool for designing XML Processing
pipelines according to the W3C standard Xproc.
• Intuitive design of XProc pipelines using Drag and Drop
• On-the-fly validation of pipelines
• Pipeline execution using the embedded EMC Documentum
XProc Engine
• Compliant to the W3C XProc specification
• On-line Help

EMC XPROC DESIGNER : KNOWN ISSUES
• The EMC XProc Designer is currently an early access
release and there are known issues and missing
features, including:
• Currently unsupported XProc constructs:
• p:import

•
•
•
•

Only basic support for authoring inline content
Limited support for namespaces
Not all static XProc errors are checked for
Currently the XProc Designer is available as a browser
application only.

EMC XPROC DESIGNER : ROADMAP
• The EMC XProc Designer is currently an early access
release and there are known issues and missing
features.
•
•
•
•
•
•
•

Importing pipeline libraries
Better support for opening 3rd party pipelines
Support for local step declarations and recursive pipelines
Better support for authoring XPath expressions
Visual debugger
Round trip text editing - visual design
Usability improvements

THE STYLUS STUDIO XML PIPELINE
TOOL
• is a powerful XML application design tool that lets
software architects design XML data services at a
higher and more integrated level, rather than
manually editing individual
stylesheets, queries, schemas, Web services.
• allows developers to quickly and easily model their
entire application as a sequence of XML processing
operations:
• A typical XML application might involve converting legacy
data into an XML format, validating the resulting XML
document, then transforming it to HTML.

STYLUS STUDIO XML PIPELINE EDITOR
IN DETAILS
• Helps create and generate code for xml pipelines
• Pipeline=Applications that perform a series of linked
xml processing operations:
• XQuery , XSLT, and xml conversion and validation

• Nodes represent xml operations, and application
processing,
• Lines between nodes, represent flow of data from
on node to another. They are called pipes.

• An xml pipeline
example that
converts a text file
and an EDI file to
xml, and uses xslt
and xquery, to
create html and pdf
reports.

INPUT FILES
booksXML.txt
•
•
•
•

•

•

•

"isbn"|"title"|"manufacturer"|"releaseDate"
"0070498873"|"Implementing CDF Channels"|"McGrawHill Osborne Media"|"06 March, 1998"
"007134621X"|"Inside XML DTDs: Scientific and
Technical"|"McGraw-Hill Companies"|"25 June, 1999"
"0071371885"|"XML: eCommerce Solutions for Business
and IT Managers"|"McGraw-Hill Trade"|"12
March, 2001"
"0071418733"|"XML for Wireless
Communications"|"McGraw-Hill Professional
Publishing"|"30 September, 2003"
"0071418741"|"XML for Wireless Communication with
CDROM (McGraw Hill Developers)"|"McGraw-Hill
Companies"|"August, 2003"
"007141956X"|"Teach Yourself HTML Publishing on the
World Wide Web"|"McGraw-Hill"|"14 January, 2003"

order.edi
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UNA:+.? '
UNB+UNOC:4+STYLUSSTUDIO:1+DATADIRECT:1+20051107:1159+6002'
UNH+SSDD1+ORDERS:D:03B:UN:EAN008'
BGM+220+BKOD99+9'
DTM+137:20051107:102'
NAD+BY+5412345000176::9'
NAD+SU+4012345000094::9'
LIN+1+1+0764569104:IB'
QTY+1:25'
FTX+AFM+1++XPath 2.0 Programmer?'s Reference'
LIN+2+1+0764569090:IB'
QTY+1:25'
FTX+AFM+1++XSLT 2.0 Programmer?'s Reference'
LIN+3+1+1861004656:IB'
QTY+1:16'
FTX+AFM+1++Java Server Programming'
LIN+4+1+0596006756:IB'
QTY+1:10'
FTX+AFM+1++Enterprise Service Bus'
UNS+S'
CNT+2:4'
UNT+22+SSDD1'
UNZ+1+6002'

HOW TO CREATE A PIPELINE
• You can create a node in a pipeline, by dragging
an icon from the toolbox, dropping it on the
pipeline canvas, then specifying its properties.
• Usually it is quicker to drop an existing xml
document on the canvas.
• If we open the XQuery file we
dropped(createFullOrder.xquey), we can see it
declares two global external variables, $ediorder,
and $allBooks,

createFullOrder.xquey
• declare variable $ediOrder as document-node(element(*, xs:untyped)) external;
declare variable $allBooks as document-node(element(*, xs:untyped)) external;
<root>
•
{
•
for $GROUP_28 in $ediOrder/EDIFACT/ORDERS/GROUP_28,
•
$row in $allBooks/table/row
•
where $GROUP_28/LIN/LIN03/LIN0301/text() = $row/isbn/text()
•
return
•
<book>
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<title>
•
{$row/title/text()}
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</title>
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<quantity>
•
{$GROUP_28/QTY/QTY01/QTY0102/text()}
•
</quantity>
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<ISBN>
•
{$GROUP_28/LIN/LIN03/LIN0301/text()}
•
</ISBN>
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</book>
•
}

createFullOrder.xquey -> SCENARIO

PROPERTIES

• These variables represent text and EDI data converted to xml using
stylus studio adapters URLs.
• So stylus studio converted those to an xml node, one for each
datasource, and connected them to the xquery we just added to
our pipeline.

• doc('converter:CSV:sep=%7C:first=yes?file:///c:/pipelines/order/booksXML.txt')
• doc('converter:EDI?file:///c:/pipelines/order/order.edi')

XQUERY OUTPUT FILE
CONFIGURATION
• Let’s save our pipeline, and specify an output URL
to quickly check the XML data aggregated by our
Xquery.
• Notice the change of colour of the ports on the
nodes when they are given default values.
• Copy to URL: result.xml

XQUERY OUTPUT
• Notice that the xml contains title data from the
converted text file, and ISBN and order info, from
the converted EDI.
• Next we will add an xslt node, to process the
aggregated xml data and create an html report.

EXECUTION FRAMEWORK
• By connecting the output of the xquery output to the input of the xslt
node, we are instructing the xml pipeline, to pass the aggregated xml
data to the XSLT node for additional processing.
• Before testing this step, let us check (scenario properties) if our xml
pipeline uses the processes we expect to find in our production
environment,

TESTING AND VIEWING THE OUTPUT
• We need to specify an additional output URL to the XSLT
output port, before testing, and as expected, it generates an
html report (result.html), designed using the stylus studio xml
publisher .
• Finally let us add the Xquery document that generates the
XSL-FO.
• Because that xquery document was specified to perform postprocessing on the xsl-fo it generates, stylus studio automatically
creates an xsl-fo node.
• We use the same output from the createFullOrder xquery node, as the
input for this step of processing.

• If we test our xml pipeline now, we see it generates both html
and pdf reports, from converted text and EDI data sources.

XML PIPELINE: CODE GENERATION
• You can
easily
generate
java
code, and
compile and
run that
code, before
deploying it
in a
application

DEBUGGING
• With a Built-in debugger that supports cross
language debugging, stylus studio has all the xml
pipeline developping covered.

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