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Re: All of the WWW Available **Forever**
- To: xanadu@xxxxxxxxxxxxx
- Subject: Re: All of the WWW Available **Forever**
- From: Edward Cherlin <cherlin@xxxxxxxxx>
- Date: Thu, 22 May 1997 00:27:44 -0700
- In-reply-to: <v01540b27afa836744ed9@[130.244.72.151]>
- Reply-to: xanadu@xxxxxxxxxxxxxxxxx
>Comments Xanni:
>
>EC> transclude:[URL]:[date]:[segment(s)]
>
>> Actually, we badly need URL extensions to support partial
>> document addressing and version selection in a standardised
>> way. If we could address ranges within documents from a URL,
>> it could be implemented using the new "Byte range" facilities
>> in HTTP. [...]
>
> The XML (Extensible Markup Language, the officially proposed
> _replacement_ for the HTML) makes use of TEI's 'Xptr' (Extended
> Pointer) mechanism, which makes possible both
>
> "bidirectional, multi-way links, as well as links to a span
> of text (within your own or other documents) rather than to
> a single point." [reference below]
>
> Ergo, I don't believe that proposing a separate URI type just
> for textual trasclusion would make much sense. After all, why
> shouldn't we be able to refer to AND possibly transclude
> specific _regions_ within n-layer types of data?
Oh, OK. Does XML provide for referring to older versions of a text that the
publisher has replaced? That was the point of my proposal, now that there
is someone archiving the whole Web, with a plan to continue at regular
intervals.
>
>__Ian
> ______ ______________________________________ LINKS TO EXPLORE
Thanks. I'll go read up on it all.
> <?XML!> http://www.ucc.ie/xml/
>
> TEI http://www.sil.org/sgml/acadapps.html#tei
> HyTime http://www.sil.org/sgml/
> Xptr http://www.ucc.ie/xml/#TEI-LINK
> EPN http://etext.virginia.edu/bin/tei-tocs?div=DIV2&id=SAXR
>
>
> XML FAQ Version 1.0.1 (May 1997)
> ______________________________________
>C.13 How will XML affect my document links?
>
> The linking abilities of XML systems are much more powerful
> than those of HTML. Existing HREF-style links will remain
> usable, but new linking technology is based on the lessons
> learned in the development of other standards involving
> hypertext, such as TEI and HyTime, which will let you manage
> bidirectional and multi-way links, as well as links to a span
> of text (within your own or other documents) rather than to a
> single point. This is already implemented for SGML in
> browsers like Panorama and Multidoc Pro.
>
> The current proposal is that an XML link can be either a URL
> or a TEI-style Extended Pointer (`Xptr'), or both. A URL on
> its own is assumed to be a resource (as with HTML); if an Xptr
> follows it, it is assumed to be a sub-resource of the URL; an
> Xptr on its own is assumed to apply to the current document.
>
> An Xptr is always preceded by one of #, ?, or |. The # and ?
> mean do the same as in HTML applications; the | means the sub-
> resource can be found by applying the Xptr to the resource,
> but the method of doing this is left to the implementation.
>
> TEI Extended Pointer Notation (EPN) is much more powerful than
> the simple ID examples given above. This_sentence,_for_example,
> marked_as_a_link,_could_be_referred_to_within_this_document_as
> ID(tei-link)CHILD(3),_meaning_the_third_object_within_the_element
> labeled_tei-link_(this_paragraph). Count the objects: a) the
> link to `TEI Extended Pointer Notation', b) the remainder of
> the first sentence, and c) the second sentence. If you view
> this file with Panorama you can click on the highlighted
> sentence above, which links to the start of this question, and
> then click on the cross-reference button beside the question
> title, and it will display the locations in Extended Pointer
> Notation of all the links to it, including the previous
> sentence. (Doing this in an HTML browser is not meaningful,
> as they do not support bidirectional linking or EPN.)
> [....]
--
Edward Cherlin Help outlaw Spam Everything should be made
Vice President http://www.cauce.org as simple as possible,
NewbieNet, Inc. 1000 members and counting __but no simpler__.
http://www.newbie.net/ 17 May 97 Attributed to Albert Einstein