Overlap SIG Meeting Minutes 23 October 2004 Dot Porter
Text Encoding Initiative

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 2004-11-12

Converted from OMSIG.txt

 Converted to P5 Create initial version, based on MS SIG's page Overlapping Markup SIG Minutes 23 October, 2004 Dot Porter November 12, 2004

Seven in attendence.

Approach: At last year's meeting (see the minutes), we had discussed creating a web site to explain in some detail many different approaches to overlapping markup. This year, we discussed some approaches that are currently in use by those of us in the SIG: the use of milestone elements and Just In Time Trees (JITTS). The traditional problem with using milestone elements extensively to deal with overlapping markup is that existing support languages (XPath, XSLT) cannot deal with non-content (that is, text between two milestone elements acting as the beginning and end tags). However, Alex Dekhtyar and Emil Iacob at the University of Kentucky have been working on an extension of XPath (Extended XPath, or EXPath) that can search overlapping encodings represented in a GODDAG. The GODDAG can be stored in an XML file with milestones (plus a set of DTDs, one per hierarchy) or in separate files: one XML file per hierarchy. In fact, the storage method is not important as long as there are parsers for GODDAG. The GODDAG implementation provides DOM-like API which can be used as well by an XML editor. They have begun working on an extension of XSLT as well. Patrick Durusau also cited a paper presented at the 2004 Extreme Markup Conference by Steven DeRose, Markup Overlap: A Review and a Horse. In this paper, DeRose outlines a system of milestone elements similar to that already implemeneted at the University of Kentucky, which he calls clix (not to be confused with Constraint Language in XML (CLIX)).

The SIG proposes to investigate the possibility of implementing within TEI a system for dealing with overlapping markup through a system of milestone elements based on clix, JITTS, and the EXPath and EXSLT support being developed at the University of Kentucky.

Provide several examples on the OM SIG website and invite TEI users to comment and criticize the approach. Invite examples of overlapping markup from the user community. Finally, make a recommendation to the TEI editors — either to look into making the milestone approach an integrated part of P5 (if it appears to handle most instances of OM), or not.

Examples

The first thing that put us out was that advertisement. Spaulding, he came down into the office just this day eight weeks with this very paper in his hand, and he says:—

I wish to the Lord, Mr. Wilson, that I was a red-headed man.

Why that? I asks.

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This example shows how we can use milestones to show, at the same time, four different and overlapping organizational sections: line = folio line vline = verse line (TEI l) HL = half line oecno = lines according to the Old English Corpus vsection = verse section (TEI lg)

I used the same id for sID and eID as we use for the regular ID.

... ... ÐV meaht be ðære sunnan sweotole geþencean 7 be æghwel- cum oðrum steorran þara þe æfter burgum beorhtost scineð. gif him wan fore wolcen hangað ne mægen hi swa leohtne leo- man ansendan ær se þicca mist þynra weorðe swa oft smylte sæ ... ... ...

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References Steven DeRose, Markup Overlap: A Review and a Horse Just-In-Time-Trees: Extended XPath language (EXPath)