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X

XML

XML Schema

XPath

XSLT

1 - XML

Extensible Markup Language is a markup language for storing/transmitting structured data. It is the working format for most Pipeline processing in Stroom and is the standard normalised format for event data.

2 - XML Schema

XML Schema is a language used to define the permitted structure of an XML document. An XML Schema can be used to validate an XML document to ensure it conforms to that schema such that onward processing of the XML document can be done with confidence that the document is correct.

The event-logging XML Schema is an example of an XML Schema.

3 - XPath

XPath is an expression language for selecting a node or nodes in an XML document. It is used heavily in XSLT to define the match criteria for templates and to select values.

4 - XSLT

Extensible Stylesheet Language Transformations is a language for transforming XML documents into other XML documents. XSLTs are the primary means of transforming data in Stroom.

All data is converted into a basic form of XML and then XSLTs are used to decorate and transform it into a common form. XSLTs are also used to transform XML Events data into non-XML forms or XML with a different schema for indexing, statistics or for sending to other systems.