Application-oriented networking was popularized by Cisco Systems in response to increasing use of XML messaging (combined with related standards such as XSLT, XPath and XQuery) to link miscellaneous applications, data sources and other computing assets.
Triggers in Sedna were designed to be analogous to SQL:2003 triggers, but natively base on XML query and update languages (XPath, XQuery and XML update language).
Saxon – alternative highly specification compliant XSLT/XPath/XQuery processor (supports both XSLT 1.0 and 2.0)
:The regular expression flavor defined in the W3C XPath standard; used in XPath 2.0, XSLT 2.0 and XQuery 1.0.
Direct measures can be defined using an Operation element which can be formulated as an Object constraints language or XQuery request on a measurand.
This is an abstract query language (like SQL and XQuery) that is independent from any other OGC service standard.
However, it has found a niche market of users not content to wait for the XQuery Update Facility extension of the W3C standard, XQuery.