X

X.500

An ISO standard for global directory structures.

X.509

Seminal standard for digital certificates.

Xerces

Apache s family of validating XML parsers.

XHTML

Rather than being a formatting scheme for XML, this is instead an XML-compliant version of HTML that adheres to the stringent document structuring rules of XML (e.g., all tags have to be closed).

XKMS

XML-oriented scheme to integrate PKI with the Internet.

XML

A platform and programming language “independent scheme for sharing data among applications and corporations in an unambiguous, consistent, and extensible manner through the use of mutually understood vocabularies.

XML Document

Fundamental framework used by XML to describe any and all data.

XML Elements

Basic building blocks of an XML document.

XML Parser

Software tool that verifies that an XML document is well formed (i.e., has no missing tags). A validating parser goes further by validating the content of a well- formed XML document against an appropriate DTD or schema.

XSL

Allows formatting to be added to an XML document using stylesheets.

XSL-FO

XML s rather sophisticated equivalent of HTML, when it comes to document formatting.

XSLT

The scripting language component of XSL.