XML Operations

XML is a medium of interchange. As a result, there are a large variety of different XML operations you can peform on XML documents, and Stylus Studio tools help you apply them. The XML Pipeline is a way to build applications out of these various tools — just download Stylus Studio, do a File -> New -> XML Pipeline and drag and drop the different XML operators from the toolbox (illustrated below) onto the XML pipeline editor's canvas and connect them together. As you can see, Stylus Studio supports a large set of possible operations, and this tutorial will explain each one.

 

Choose

The Choose block allows you to do conditional branching, based on matching XPath expressions. Any number of XPath expressions may be matched in a single Choose block, with each sending the output in a different direction.

Model conditional statements in your XML pipeline

Convert From XML

Data doesn't always come in as XML. When the XML Converters are involved, this block represents the conversion step from some non-XML format to XML. This includes the Convert to XML module, as well as the various native converters such as CSV and EDI.

Convert To XML

Just as the input doesn't have to be XML, the output can also be sent through the converters to become a non-XML format. If your idea is to write specialized output such as one of the EDI standards including HL7, EDIFACT, EANCOM, IATA and X12.

HTML Tidy

When you are scaping web pages, typically the HTML isn't very clean. To convert incoming HTML to XHTML suitable for XQuery, XSLT and/or XPath navigation, we've provided the HTML Tidy block. HTML goes in, XHTML comes out.

Pipeline

To support modularity and componentization, we allow you to build big pipelines out of little pipelines. This glyph represents an embedded pipeline. There is no specific limit on the nesting or size of nested pipelines. You can set breakpoints to see how the data looks coming in or going out of each node, and you can even step into nested piplines and even right into the XSLT or XQuery code being called.

Pipeline Input

When you plan to embed a pipeline, a Pipeline Input block provides a port to which you can feed in data. You may have any number of input ports, and can distinguish them by name.

Pipeline Input

Pipeline Output

Just as you can name the inputs, you can name the outputs, and send the output from one step in as many directions as you want. Think of pipelines as little XML integrated circuits or building blocks.

Pipeline Output

Stop

Sometimes things go wrong. It's better that you handle them in a predicable fashion than processing continue with bad data. The Stop glyph acts as a destination that will halt the pipeline should it be reached. It can be used as the target of a failed Validation block, or reached by a conditional Choose block.

Stop Processing the XML

Validate

If you want to make sure the data coming in conforms to some schema, or the data going out matches what you think you are writing, or even the data between steps is within some boundaries, the Validate block is what you need. You can assign an XML Schema document to this glyph, and the output will branch in one of two ways - passed or failed.t

Validate XML

Warning

The Warning glyph allows you to insert warning messages into the pipeline. For example, you could have a Choose block send a warning when a certain threshold or condition is reached. The pipeline will continue, but a message will be sent to the error handler.

XML warning

XML Parser

To bring XML in, whether from the local file system, from HTTP or HTTPS, from FTP, from a callout to a Web Service, from a relational data source, or from a variety of other sources, you may use the XML Parser node.

XML Parser Operations

XML Serializer

When it comes time to generate XML output, this node represents the serializer. It has options to pretty-print (indent) the XML and set the output encoding.

Perform a serialization operation on your XML data

XQuery

Whether you need the schema-aware capabilities of Saxon-SA or the highly-tuned performance of DataDirect XQuery with its embedded JDBC drivers, the XQuery node serves as your launching point.

XQuery Operations

XSL-FO

The most common use of XSL-FO is to produce PDF output, and to do this Stylus Studio® includes both the Apache FOP open source engine and a license to the RenderX XEP personal edition engine. And the Publishing tool means you don't have to create the XSLT or XQuery to generate that FO, but we can do it for you.

XSL:FO Operations

XSLT

The XSLT block represents any XSLT transform. Both XSLT 1.0 and 2.0 are supported. If a breakpoint is set on an XSLT block, you can then step right in to the XSLT - which will open in another window, and continue right on debugging.

XSLT Operations

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