- From: Martin Bryan <mtbryan@sgml.u-net.com>
- Date: Fri, 03 Jan 1997 17:42:45 +0000
- To: "W. Eliot Kimber" <eliot@isogen.com>, dgd@cs.bu.edu (David G. Durand), w3c-sgml-wg@www10.w3.org
>I don't know what Martin means by "link chains". This is not a HyTime term. >If he means "location ladders", then you can have location ladders without >requiring entity declarations (although the use of entities would be the >SGML/HyTime recommended method). I did mean location ladders. The HyTime TC says (twice, so you have to believe it!) that "The ultimate location source for any location ladder is the root of a grove". It also says "If the location source is a document, subdocument or data entity, the location source is within the grove constructed from that entity". (Note the use of the term entity!) In XML terms, where application dependent groves are not likely to be permitted, this in practice means the root of the file being referenced if no finer resolution is given in the pointer as it has to be presumed that the reference is to a free-standing XML document. While this reference could be done indirectly using a query that contains a URL the SGML way of identifying files is by having the root of the document identified via a uniquely named entity declaration. What I am unclear about is what would constitute a the grove of something pointed to using a URL of the form report.html#point1 if the HTML page pointed to was constructed as follows: <p>The points raised were: <ul><li><a name=point1></a>How useful is HyTime <li><a name="point2"></a>How useful is HyTime Given the fact that most documents on the Web would not allow sensible groves to be constructed from existing named anchors the relevance of HyTime location sources for linking XML files to HTML anchors must be considered. My personal preference would be to say that pointers to named HTML anchors should be handled by a special architectural form that has nothing to do with HyTime location addresses, but that we provide HyTime compatible architectural forms for handling links that cannot be expressed using the far-too-simple HTML anchor constructs. ---- Martin Bryan, The SGML Centre, Churchdown, Glos. GL3 2PU, UK Phone/Fax: +44 1452 714029 WWW home page: http://www.u-net.com/~sgml/
Received on Friday, 3 January 1997 12:44:27 UTC