XENPAK

Standard that defines a type of pluggable fiber-optic transceiver module which is compatible with the 10-Gigabit Ethernet (10 GbE) standard.

XENPAK-ZR 10GBASE-ZR XENPAK

Media type used for long-reach, single-mode (80-120 km) 10-Gigabit Ethernet metro applications.

XENPAK-SR 10BASE-SR XENPAK

Media type that supports a link length of 26 meters on standard Fiber Distributed Data Interface (FDDI) grade multimode fiber (MMF). Up to 300-meter link lengths are possible when using 2000 MHz/km MMF (OM3).

XML

Extensible Markup Language. Language used for defining a set of markers, called tags, that define the function and hierarchical relationships of the parts of a document or data set.

XML Path Language

See XPath.

XML schema

Definition of the elements and structure of one or more Extensible Markup Language (XML) documents. Similar to a document type definition (DTD), but with additional information and written in XML.

XOR

Exclusive or. A logical operator (exclusive disjunction) in which the operation yields the result of true when one, and only one, of its operands is true.

XPath

A standard used in XSLT to specify and locate elements in the input document's XML hierarchy. XPath is fully described in the W3C specification at http://w3c.org/TR/xpath.

XSLT

Extensible Stylesheet Language for Transformations. A standard for processing XML data developed by the World Wide Web Consortium (W3C). XSLT performs XML-to-XML transformations, turning an input XML hierarchy into an output XML hierarchy. The XSLT specification is on the W3C Web site at http://www.w3c.org/TR/xslt.