[tei-council] updated facsimile odd

[Conal Tuohy]

I have uploaded an updated ODD to match the diagram I uploaded earlier.

http://tei.oucs.ox.ac.uk/trac/TEIP5/attachment/ticket/291/fax-for-august-teleconference.odd

Also, there is a little bit of documentation in the ODD, which I reproduce below:

1 Graphical facsimiles

1.1 Overview

This section deals with recording the planar co-ordinates of textual elements on the page; and linking those pages with digital facsimile images.

There are several applications for encoding the relationship between pages and facsimile images, and between pages and text. It can be used as the basis for full text search in ‘digital facsimle editions’, as well as for annotating figures and graphics, such as identifying individuals appearing in group portraits.

1.2 The <surface>, <graphic>, and <zone> elements

1.2.1 The <surface> element

The <surface> element represents a physical page of the source material. This may be a sheet of paper, a billboard, a papyrus scroll, or indeed any 2-dimensional surface which forms part of the source material.

Each <surface> element may contain any number of <graphic> elements, which represent facsimiles of the page, and any number of <zone> elements which represent rectangular areas of the page used as units of analysis.

1.2.2 The <zone> element

The <zone> element represents a rectangular region on the page represented by its parent <surface> element.

An <zone> is a unit of analysis, used to define a region of the page in order to say, typically, that some particular text appears there.

The <zone> element's function is as a graphical stand-off markup; that is, it is linked to a fragment of text using a pointer, and represents that fragment of text graphically, defining the area of the page on which that fragment of text appears. By using an <zone>, the graphical aspect of the text is encoded separately from the textual aspects, with the correspondences between the two aspects encoded using pointers.

An alternative to using the <zone> element is to encode the coordinates of pieces of text directly, as attributes of the elements containing the text.

1.2.3 The <graphic> element

Within a <surface> element describing a particular page, each <graphic> element represents one digital facsimile image of that page. Any number of <graphic> elements may appear within a <surface>, in order that the page may be represented by images taken under multiple lighting conditions, with different resolutions or file formats, or by detail images covering only certain areas of the page.