This site contains terms and definitions from many IBM software and hardware products as well as general computing terms.
In data communications, an interim specification of the CCITT that defines the connection of data terminal equipment (DTE) to an X.21 (public data) network using V-series interchange circuits such as those defined by CCITT V.24 and CCITT V.35.
A CCITT standard that defines an interface to packet-switched communication services. See also packet switching.
See X.25 Interface Co-Processor/2.
An interface consisting of a data terminal equipment (DTE) and a data circuit-terminating equipment (DCE) in communication over a link using the procedures described in the CCITT Recommendation X.25.
X.25 NCP Packet Switching Interface (NCP Packet Switching Interface, NPSI)
An IBM licensed program that allows SNA users to communicate over packet switching data networks that have interfaces complying with CCITT Recommendation X.25. It allows SNA programs to communicate with SNA or non-SNA equipment over such networks.
- See extended architecture.
- A bidirectional interface between one or more resource managers that provide access to shared resources and a transaction manager that monitors and resolves transactions. See also distributed transaction, XA transaction.
An XSLT processor that is part of the Apache project. See also XSL Transformation.
- A global transaction that adheres to the X/Open standard for distributed transaction processing (DTP).
- In an XA-enabled environment, a unit of work involving one or more resource managers that is coordinated by a transaction manager. See also XA.
- In printing, the axis perpendicular to the direction in which the paper moves through the printer. See also Y-axis.
- In a system of coordinates, the axis of the first component used to locate points in space (X-axis, Y-axis, and Z-axis).
- See X/Open Backup Services API.
- An industry-standard API set for backup and restore utilities.
See external communication adapter.
See XML common analysis structure.
See cross-system coupling facility.
XCF couple data set
A data set that is created through the cross-system coupling facility (XCF) couple data set (CDS) format utility and, depending on its designated type, is shared by some or all of the systems in a sysplex.
XCF PR/SM policy
In a multisystem sysplex on PR/SM, the actions that the cross-system coupling facility (XCF) takes when one MVS system in the sysplex fails. This policy provides high availability for multisystem applications in the sysplex.
See extended common object file format.
- The horizontal, or x-axis, positioning information of an object on a map. The X-coordinate is measured along the east-west axis from an origin (0,0).
- The horizontal or inline position that defines a page origin or the starting point of a line or field.
See XML data area.
See XML data configuration file.
See XQuery and XPath data model.
See extended data object.
See External Data Representation.
See cross-system extended services.
A separate extent, part of the system log. During backout in emergency restart, system log records are written to the X extent. The presence of an X extent is mandatory if CICS Transaction Server is using a local DL/I system; otherwise, it is optional. The X extent can be used for audit purposes.
The primary data field in a chart. In a line chart, typically the X field appears along the horizontal axis. For example, an X field can represent cost data for the elements that appear along the horizontal axis of the chart.
See Graphics Support Library.
- The nominal height above the baseline, ignoring the ascender, of the lowercase characters in a font. X-height is usually the height of the lowercase letter x.
- The body of a lowercase letter, which is equivalent to the height of the lowercase x in the selected type family.
See Extensible Hypertext Markup Language.
- See transaction identifier.
- See exchange identification.
- See X/Open identifier.
- See exchange station ID.
See XML Enhancements for Java.
See transaction list table.
See XML Metadata Interchange.
See Extensible Markup Language.
A catalog that contains rules specifying how an XML processor should resolve references to entities. Use of a catalog eliminates the need to change URIs within XML documents as resources are moved during development.
A Content Platform Engine function that identifies a document type by examining the contents of XML documents. The XML classifier applies the script contained in the XML property mapping script to determine property mappings.
XML common analysis structure (XCAS)
An XML representation of the CAS. It can be used for saving and restoring CASs to and from streams. See also common analysis structure.
- Data of type XML, including serialized XML or XDM instances. See also serialized XML, XDM instance.
- A collection of hierarchical nodes, based on XML instance documents, that can be stored in an XML column or can be returned from an XML column by an SQL or XQuery statement.
XML data area (XDA)
See XML storage object.
XML data specifier (XDS)
A string specifying the name, location, and validation schema for a file containing stored XML data. The import, export, and load utilities use an XDS to identify XML-formatted content that must be stored separately from the main data file.
The message domain that includes all messages that conform to the W3C XML standard. The XMLNS domain is an extension of the XML domain and contains messages that conform to the same standard and that can exploit the namespaces feature of the XML specification. Messages in this domain are processed by the XML parser. See also JMS domain, MRM domain.
XML encoder object
A compiled map that translates data from either the input or output side of a source map into XML. EDI, positional, and variable-length delimited data formats can be compiled into XML encoder objects.
XML Enhancements for Java (XJ)
An extension to Java that supports XML, XML Schema, and XPath as first-class constructs. XJ introduces XML support to Java in a way that makes programs based on XML easier to develop.
- An index on an XML column that provides efficient access to nodes within an XML document by providing index keys that are based on XML patterns.
- See index over XML data.
XML mapping template
This template processes inbound XML messages and translate them to WebSphere Commerce command parameters. The mapping template file defines how to map the elements of an incoming XML message into the target command parameters.
XML message mapper
A mechanism that converts the incoming XML message into a Java object that the target command expects. A message mapper can be registered with the instance_name.xml configuration file and is uniquely by a message mapper ID. The XML message mapper uses the mappings defined in the mapping template file to convert the XML message into the corresponding Java command parameter.
XML Metadata Interchange (XMI)
A model-driven XML integration framework for defining, interchanging, manipulating, and integrating XML data and objects. XMI-based standards are in use for integrating tools, repositories, applications, and data warehouses.
A collection of names, identified by a Universal Resource Identifier (URI) reference, used in XML documents as element types and attribute names. An XML namespace allows a user to include multiple XML vocabularies in a single XML document without ambiguity of names.
XML path index
A system-generated index that is associated with an XML column and contains all unique paths that exist in the XML documents that are stored in that XML column. Each XML column in a table has an XML path index.
XML Path Language (XPath)
A language that is designed to uniquely identify or address parts of source XML data, for use with XML-related technologies, such as XSLT, XQuery, and XML parsers. XPath is a World Wide Web Consortium standard. See also XML Path Language injection.
XML Path Language injection (XPath injection)
An attack technique used to exploit websites that construct XPath queries from user-supplied input. If an application embeds unsafe user input into the query, it may be possible for the attacker to inject data into the query so that the newly formed query will be parsed differently from the programmer's intention. See also XML Path Language.
A slash-separated list of element names that describes a path through an XML document and through specific node characteristics. The pattern selects elements that match the specifications. XML patterns are specified to create indexes on XML columns in a database.
XML root element
The implicit highest-level node of a parsed XML document. It may not always be possible to predict which element will be the document element of a parsed instance, but it will always have a root node that can be used for preliminary or setup processing.
- A means for defining the structure, content, and semantics of XML documents as defined by a World Wide Web Consortium (W3C) recommendation.
- A mechanism for describing and constraining the content of XML files by indicating which elements are allowed and in which combinations. XML schemas are an alternative to document type definitions (DTDs) and can be used to extend functionality in the areas of data typing, inheritance, and presentation.
XML Schema Definition (XSD)
An instance of an XML schema written in XML Schema definition language. An XML Schema Definition file has the extension .xsd. The prefix "xsd" is also typically used in the XML elements of the XSD file to indicate the XML Schema namespace.
XML schema document
An XML document with <schema> as the root element that defines the components in one namespace of an XML schema. An XML schema with components in more than one namespace consists of multiple XML schema documents.
XML schema repository (XSR)
A repository that allows the DB2 database system to manage dependencies on externally referenced XML artifacts in XML instance documents within a database. Supported XSR objects include XML schemas, document type definitions (DTDs), and other external entities. When registered with the XSR, these objects have a unique identifier and can be used to validate XML instance documents. See also XSR object.
The statistics that are collected on XML data that is stored in an XML column. The information includes path distribution statistics, which show the frequency of all distinct root-to-node paths. The information also contains path-value distribution statistics, which show the frequency of XML value strings that are truncated to fixed-length prefixes to conserve space.
XML table space
A table space that is implicitly created when an XML column is added to a base table. The table space stores the XML table. If the base table is partitioned, one partitioned table space exists for each XML column of data.
See XDM instance.
X/Open Object Management (XOM)
An interface for creating, deleting, and accessing objects. Because XOM is object-oriented, each object belongs to a particular class, and classes can be derived from other classes, inheriting the characteristics of the original class. The representation of the object is transparent to the programmer; the object can be manipulated only through the XOM interface.
X/Open Transport Interface (XTI)
A library implementation that defines the set of transport-level services that are independent of any specific transport provider's protocol or its framework. The X/Open Transport Interface is specified by X/OPEN CAE Specification of X/Open Transport Interface and is fully conformant to X/OPEN and the XPG4 Common Application Environment (CAE) specification.
The X/Open Distributed Transaction Processing XA interface. A proposed standard for distributed transaction communication. The standard specifies a bidirectional interface between resource managers that provide access to shared resources within transactions, and between a transaction service that monitors and resolves transactions.
See extreme programming.
A digital trunk processor implemented using DSP technology on the DTXA without the need for external hardware. One XPACK is directly equivalent to one SPACK. One DTXA provides up to four XPACKs on a PCI card. See also SPACK, VPACK.
An XML-based design element and development technology available from Domino Designer. An XPages application is XML interpreted by a Domino server or Notes client and rendered in a web browser or a Notes client. Users can interact with controls on the page to send requests to the server.
See XML Path Language.
See XML Path Language injection.
See Extensible Program Call Markup Language.
Xpg,Ypg coordinate system
The coordinate system of a page presentation space. This coordinate system describes the size, position, and orientation of a page presentation space. Orientation of an Xpg,Ypg coordinate system is relative to an environment specified coordinate system; for example, an Xm,Ym coordinate system.
See Extra Performance Linkage.
See cross-application performance reliability stress test.
See X-Press Update.
XQuery and XPath data model (XDM)
The abstract logical structure that defines all permissible values in the XSLT 2.0, XQuery 1.0, and XPath 2.0 languages. The XDM is described in terms of sequences of atomic values and nodes. See also atomic value, node, sequence, XDM instance.
An XML query language for interpreting, retrieving, and modifying data as defined by the XQuery and XPath data model, such as XML documents. XQuery Version 1.0 is an extension of XPath Version 2.0.
See extended remote copy.
- In AIXwindows and Enhanced X-Windows, a unique characteristic of appearance or behavior that is associated with one specific class of graphical object. Resources can be passed downward (inherited) by each subclass that is downstream from a higher-level class in the class hierarchy.
- In Enhanced X-Windows, a named piece of data in a widget that can be set by a client, by an application, or by user defaults.
See extended recovery facility.
See extended restart.
See XML Rule Language.
See extended subarea addressing.
See XML Schema Definition Language.
A program that interprets the X protocol and controls one or more screens, a pointing device, a keyboard, and various resources associated with the X Window System, such as graphics contexts, pixmaps, and color tables.
See Extensible Stylesheet Language.
XSL Transformation (XSLT)
A standard that uses XSL style sheets to transform XML documents into other XML documents, fragments, or HTML documents. See also Xalan processor.
See cross-site mirroring.
See XML schema repository.
An XML artifact that is registered in the XML schema repository (XSR) and is used to validate XML instance documents. Supported XSR objects include XML schemas, document type definitions (DTDs), and other externally referenced entities. See also XML schema repository.
See cross-site scripting.
See X/Open Transport Interface.
In the Enhanced X-Windows Toolkit, a set of management mechanisms that provides for constructing and interfacing between composite widgets, their children, and other clients. Also, intrinsics provide the ability to organize a collection of widgets into an application.
See AIXwindows Toolkit.
See execution unit.
X Window System
A software system, developed by the Massachusetts Institute of Technology, that enables the user of a display to concurrently use multiple application programs through different windows of the display. The application programs can execute on different computers. See also Athena widget set, Enhanced X-Windows Toolkit.