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XML Linking: State of the Art by Eve Maler	Eve Maler's short, updated overview describes the features, benefits, and basic technical details of XML linking technologies, including links, arcs, XPointers, relationship to XPath, etc. Includes a code example which works in Netscape 6. An older version of this article, XML Linking: An Executive Summary, is still available. (Eve Maler, formerly with ArborText, now works for Sun Microsystems. She is a co-chair of the W3C's XML Linking working group and is co-editor of the W3C XLink and XPointer specifications. Her XML 2000 XLink and XPointer presentation is covered on WDVL.)
What is XML Linking? by Steve DeRose	Steve DeRose (Inso Corp. and Brown University ) is the other co-author of XLink and XPointer specifications. This introduction nicely summarizes the extra capabilities that both XLink and XPointer will provide. It was last updated Sept. 1999, so the articles by Eve Mahler (above) and Fabio Arciniegas A. (below) are much more up-to-date.
What is XLink? by Fabio Arciniegas A.	This XML.com article from Sept. 2000 includes a nice overview plus a very handy an XLink Reference. See also the XLink Technologies article on XML.com.
Zvon XLink and XPointer Tutorials and References	Zvon has several XLink and XPointer tutorials and references: XLink - Simple Links Tutorial XLink - Extended Links Tutorial XLink Reference XPointer Tutorial XPointer Reference Elliott Rusty Harold's XML Bible, 2nd Edition includes very good tutorials: Ch. 19: XLinks Ch. 20: XPointers
XPointer and the Patent by Leigh Dodds	This XML.com article from Jan. 2001 explains the controversy concerning a 1997 Sun Microsystems patent, "Method and system for implementing hypertext scroll attributes" which threatens to halt final acceptance of the XPointer, which was demoted from a Candidate Recommendation (June 2000) to a Last Call Working Draft (Jan. 2001). As of Sept. 2001, XPointer regained its Candidate Recommendation status.
XML Pointer, XML Base and XML Linking	This is the W3C Linking home page which provides abstracts and links for XPointer, XBase, and XLink. Also included are links to documentation and associated resources, W3C status, and implementations.
XLink Recommendation	The current XLink spec is called the XML Linking Language (XLink) Version 1.0 Recommendation from the World Wide Web Consortium (W3C). It became a W3C Recommendation on June 27, 2001 after having achieved sufficient implementations. The W3C abstract states that XLink "allows elements to be inserted into XML documents in order to create and describe links between resources. It uses XML syntax to create structures that can describe links similar to the simple unidirectional hyperlinks of today's HTML, as well as more sophisticated links." See related XLink W3 documents: XML Base - defines xml:base attribute used by XLink and other specs to locate relative URIs XLink Requirements XML Linking Language (XLink) Design Principles XLink Markup Name Control - a possible XML Schema-based solution to the need to use XLink in XML-based languages such as XHTML 1.0. Topic Maps and XTM (XML Topic Maps) various XPointer documents listed below
XPointer Specification	The current XPointer spec is called the XML Pointer Language (XPointer) Version 1.0 Candidate Recommendation from the W3C. XPointer became first a Candidate Recommendation on June 7, 2000, but moved backwards to Last Call Working Draft status in January 2001 due to some implementation and patent problems. The spec regained its Candidate Recommendation status on that fateful day, September 11, 2001. According to the abstract from the spec, "XPointer, which is based on the XML Path Language (XPath), s supports addressing into the internal structures of XML documents and external parsed entities. It allows for examination of a hierarchical document structure and choice of its internal parts based on various properties, such as element types, attribute values, character content, and relative position." See related XPointer W3 documents: XPointer Requirements XPointer-Information Set Liaison Statement various XLink documents listed above
XLink and XPointer Resources	In addition to the current WDVL XLink page, the following sites provide a number of useful references: Robin Cover's Extensible Linking Language (XLL) page; also includes XPointer and XPath XLink/XPointer news items from xmlhack XML.com Resource Guide: XLink, XPointer and related topics XLink/XPointer Tools at XMLSOFTWARE - lists all known implementations; see also W3C's list of implementations XLINKguru.com
XML Linking Working Group	From the XML Activity page of the W3C: "The XML Linking Working Group is designing hypertext links for XML. Engineers defining the way that links are to be written in XML have made a distinction for links between objects - "external" links, and "internal" links to locations within XML documents, and both types will receive detailed treatment by this group. The objective of the XML Linking Working Group is to design advanced, scalable, and maintainable hyperlinking and addressing functionality for XML." There is no separate XPointer Working Group. If your company is a member of the W3C, see this password protected page: XML Linking Working Group and Interest Group.
XLink and XPointer Software	While it's still a little early to find lots of mature tools that support the XLink Recommendation and XPointer Candidate Recommendation, one noteworthy product is X2X from empolis (formerly Step UK); creation, management and manipulation of links. For other XLink/XPointer software, see W3C's XML Linking Implementations (include XLink and XPointer) XLink/XPointer Tools by James Tauber Robin Cover's XLink/XPointer software info.
XLinkFilter Resources	This page by XML author Simon St.Laurent also lists XLink and XPointer resources and applications. St.Laurent is working on his own project, XLinkFilter: An Open Source Java XLink SAX Parser Filter. He has also published his second XML book, Building XML Applications.
XArc (a.k.a. XLink--++)	According to the author, Gabe Beged-Dov, XArc, an unofficial proposal to the web community for open review, "is a very simple specification for describing directed labeled graphs in XML. The XArc construct provides the minimal support necessary for this task. Using XArc it is then possible to emulate both the XML Linking Language (XLink) and the Resource Description Framework (RDF)."
Text Encoding Initiative (TEI)	Text Encoding Initiative (TEI), is an "international project to develop guidelines for the preparation and interchange of electronic texts for scholarly research". Text Encoding Initiative Guidelines (TEI P3) provides a formal syntax for location specifiers for structured data, graphics, and other data, relevant to XPointer. The XPointer language is based on TEI extended pointers. TEI P3 also provides structures for creating links, aggregate objects, and link collections, all of which are relevant to XLink. See Extended Pointers from the TEI Guidelines. See also the searchable and browsable version of TEI Guidelines for Electronic Text Encoding and Interchange.
Hypermedia/Time-based Structuring Language (HyTime)	Hypermedia/Time-based Structuring Language (HyTime) is an effort of ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission). HyTime defines location specifier types for all kinds of data, which is relevant to XPointer. HyTime also defines inline and out-of-line link structures and some semantic features, including traversal control and presentation of objects, which is a basis for XLink.
XLink and XPointer Mailing List Archive	Technical discussions of both XLink and XPointer for developers, established Dec. 1998. To subscribe, send a message to: majordomo@fsc.fujitsu.com In the body of the message put: subscribe xlxp-dev Post messages to: xlxp-dev@fsc.fujitsu.com