Hugh C. Davis. To Embed or Not to Embed. Communications of the ACM, 38(8):108--109, August 1995. 7 Freely available at http://www.webreference.com/  Home/Search   Document Not in Database   Summary   Related Articles   Check

....into the document, it is explicit and pre computed [1] Hypermedia research however suggests broader and more general link functionality. Namely n ary links (linking more than two locations) separation of link and content, and annotations, are mentioned and implemented in existing systems [16,21,7,5,2], as described in Section 2. A more elaborate link model would not only increase the capabilities of the Web as a hypermedia system, the usability of the Web would also be improved. The main improvements from a user point of view are: Educated choices Right now, users are left with little or ....

Hugh C. Davis. To Embed or Not to Embed. Communications of the ACM, 38(8):108--109, August 1995. 7 Freely available at http://www.webreference.com/

....is transported through the framework separately from the mediadata, rather than multiplexed within it. This allows for a much more flexible framework of distributed processing and presentation. The arguments against embedding metadata are well rehearsed in the hypermedia research community [Davis95]. The distinction between mediadata flow and metadata flow may in reality be blurred, if metadata essential to the reproduction of the mediadata is interlaced into the mediadata flow. It can be argued that what may be metadata in one case should be mediadata in another, and in many ways this is ....

Hugh C. Davis. To embed or not to embed. Communications of the ACM, 38(6):108-109, August 1995.

....HELLO WORLD in section 3.0 of a given document then the Acrobat plug in can locate the page position of that anchor at the last possible moment thereby avoiding the problems of hard embedded links becoming out of date. Separable hyperlinks have been argued to be advantageous for many reasons ( Dav95] Pea89] and [GT94] the latter based on the Dexter Hypetext Model [HS90] They allow the 4 author or reader of a document to create a personalised overlay of hypertext structure that is (to some extent) insulated from changes made to the source document s data or formatting. They also enable ....

Hugh Davis. To embed or not to embed. Communications of the ACM, 38(6), August 1995.

....renamed or deleted. Embedded links are not useful for data that cannot be overwritten, such as for read only data or data owned by others, and this is what motivates the use of externalised links in systems such as Microcosm, despite their greater chance of link error. The reader is referred to [Davis 1995] for a discussion of embedded versus externalised links. 3.4 Regular updates This strategy is preventative, if links are issued with the new documents, or corrective otherwise. Information changes at predictable intervals, i.e. information is issued in editions . Notification of changes is ....

DAVIS, H. To embed or not to embed, Communications of the ACM 38, 8 (August 1995), pp 108-109.

....they are dynamic objects, multi versioned (in contrast to Dexter) and they are able, thanks to the strong interconnectivity realised by the communication, to support important functions, such as information retrieval [18] and the WhoIncludesMe [46] ffl Link service. As pointed out by Davis [23], hypermedia systems may be classified by how they store both links and the information indicating their destination nodes and which areas within a node s content are hotspots . Davis indicates three actual approaches to storing this information: 1. Embed all the information within node content ....

Davis, H. (1995). To Embed or Not to Embed . . . . Communications of the ACM, 38(8):108-109.

....besides the documents themselves. If the links are bound too closely to the documents, they cannot be applied to new documents. The similarities with the web concept in the Intermedia project are striking and indeed Microcosm is a strong advocate for the get the links out of the data principle [Davis 95]. Microcosm takes a slightly different approach however. Besides specific links between particular locations inside specific documents, the Microcosm system has this notion of a generic link, which once authored from a certain pattern (be it a text string or a piece of multi media information ....

.... that the original data must remain unchanged (this is called document sanctity) since one cannot be sure to have write access to the information (i.e. the data can reside on read only media such as a CD ROM) Document sanctity is another argument for the get the links out of the data principle [Davis 95]. OHS REQ 2) Data Formats The system should allow the import and use of any data format, including temporal media. This can be read as a multi media requirement, although it covers issues like legacy data formats and encryption techniques as well. The requirement implies at least the ability to ....

Davis, H. "To Embed or Not to Embed ..."; Communications of the ACM - Vol. 38(6) - August '95. Available on the world-wide web via http://www.acm.org/siglink/.

....we propose that the OHP protocol will have a number of levels of conformity, and it would thus be possible to describe a given application as OHP aware to some given level. 3. Anchors One of the major differences between hypertext implementations is the way that anchors have been treated (Davis, 1995). The issues, from the point of view of hypertext enabling third party applications, are: where anchors are stored; how new anchors are allocated; how the anchor refers to the object within the node data that is to be the physical manifestation of that anchor. Questions about the ....

Davis, H.C. To Embed or Not to Embed..., Communications of the ACM, Vol 38(8), pp 108-109. August 1995.

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Dav95. H. C. Davis. "To Embed or Not to Embed". Communications of the ACM, vol. 38(6):pp. 108--109, Aug. 1995.

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H. Davis, #ToEmbed or Not to Embed ...", CACM 38 #1995# 108-109.

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