rfc1691.txt
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RFC 1691 CDL Document Architecture August 1994
Physical References File Example
+0|CORNELL|OLINLIB|00000001|Boole, Mary Everest||Philosophy Of Algebra||
|0|1|00000002|5|1|| (File ref. #2 = Phys. ref. #5 = 600dpi TIFF image)
|0|2|00000003|5|2|| (File ref. #3 = Phys. ref. #5 = 100dpi TIFF image)
|0|3|00000004|6|1|| (File ref. #4 = Phys. ref. #6 = 600dpi TIFF image)
|0|4|00000005|6|2|| (File ref. #5 = Phys. ref. #6 = 100dpi TIFF image)
Note that in the above, it is guaranteed that file references 2 and 3
are two different versions of the same page, as are file references 4
and 5.
Logical Structure File
The Logical Structure file is the component of the document structure
which offers "views" of a document and links images together
logically to define documents. The file is actually an unloaded tree;
when a document is "opened", the file is read and the tree
reconstructed. By convention, all Logical Structure files contain one
logical structure "PAGES" which defines the document by listing the
pages in the order in which they appeared in the original document.
Document Structure lines
Field Description Comments
----- ---------------------- ----------------------------
1 Parent structure number Structure is a child of...
2 Sequence number
3 Logical Structure name Label for this structure
4 Structure number Equal to Physical Reference file
5 Logical Children # of logical children of this
structure
Document Structure lines (continued)
Field Description Comments
----- ---------------------- ----------------------------
6 Physical Children # of physical children of this
structure
7 References # of references to this
structure within this document
(for how many structures is this
a substructure)
Turner [Page 6]
RFC 1691 CDL Document Architecture August 1994
Logical Structure File Example
|0|0|ROOT|0|4|0|0| Structure 0, ROOT, has 4 logical children
|0|1|PAGES|1|100|0|1| Str. 1, PAGES, has 100 logical children
|0|2|CONTENTS|2|22|0|1| Str. 2, CONTENTS, has 22 logical children
...has no physical children
...
|1|1|Production note|5|0|2|2| Str. 5 is child of structure 1
...has a label "Production note"
...has no logical children
...has 2 physical references
...is referenced twice in this document
|1|2||6|0|2|1| Str. 6 has no label
|1|3||7|0|2|1| Str. 7 has 2 physical references
|1|4||8|0|2|1| Str. 8 is referenced only here
|1|5||9|0|2|1| Str. 9 is 5th sequential child of PAGES
...
|1|99||103|0|2|2|
|1|100||104|0|2|2|
|2|1|Production note|105|1|0|1| Str. 105 is a child of str. 2
|2|2|Title page|106|1|0|1| Str. 106 has 1 logical child
|2|3|Table of contents|107|2|0|1|
|2|4|Chapter 1. From Arithmetic to Algebra|108|6|0|1|
|2|5|Chapter 2. The Making of Algebras|109|4|0|1|
|2|6|Chapter 3. Simultaneous Problems|110|4|0|1|
|2|7|Chapter 4. Partial Solutions...|111|3|0|1|
|2|8|Chapter 5. Mathematical Certainty...|112|3|0|1|
|2|9|Chapter 6. The First Hebrew Algebra|113|8|0|1|
|2|10|Chapter 7. How to Choose our Hypotheses|114|9|0|1|
|2|11|Chapter 8. The Limits of the Teachers Function|115|5|0|1|
|2|12|Chapter 9. The Use of Sewing Cards|116|4|0|1|
...
|2|20|Chapter 17. From Bondage to Freedom|124|5|0|1|
|2|21|Appendix|125|2|1|1|
|2|22|advertisements|126|4|1|2|
|105|1|Production note|5|0|2|2| Str. 5 is a child of str. 105
|106|1|Title page|11|0|2|2| 2nd reference to str. 11
|107|1|7|15|0|2|2|
|107|2|8|16|0|2|2|
...
|126|4||104|0|2|2|
Turner [Page 7]
RFC 1691 CDL Document Architecture August 1994
Implementation Details
The tuple <library ID>+<collection ID>+<document ID>+<filetype>+
<file reference> is guaranteed to locate a file. A file locator
program will translate between this tuple and the fully-qualified
path and file name in the underlying file system. While a library
will always have a hierarchical nature corresponding to UNIX file
systems, the order of the hierarchy will be flexible to accommodate
optimization efforts. Each level of the hierarchy will have an INFO
file that describes the order of the lower levels of the hierarchy.
The file locator program will read these files as it navigates the
directory structure of the file system when a library, collection, or
document is opened. Two examples follow:
Example 1. Hierarchy is LIBRARY, COLLECTION, DOCUMENT, FILETYPE.
/<library name>
LIBINFO.TXT Description of library
/<collection name>
COLINFO.TXT Description of collection
/<document ID>
DOCINFO.TXT Description of document
LOGSTR.000 Logical structure file
PHYSREF.000 Physical reference file
/<filetype1>
00001.TIF
00002.TIF
...
/<filetype2>
00001.TIF
00002.TIF
...
Turner [Page 8]
RFC 1691 CDL Document Architecture August 1994
Example 2. Hierarchy is LIBRARY, FILETYPE, COLLECTION, DOCUMENT.
/<library name>
LIBINFO.TXT Description of library
/<filetype1>
/<collection name>
COLINFO.TXT Description of collection
/<document ID>
DOCINFO.TXT Description of document
LOGSTR.000 Logical structure file
PHYSREF.000 Physical reference file
00001.TIF
00002.TIF
...
/<filetype2>
/<collection name>
COLINFO.TXT Description of collection
/<document ID>
DOCINFO.TXT Description of document
LOGSTR.000 Logical structure file
PHYSREF.000 Physical reference file
00001.TIF
00002.TIF
....
This implementation involves some redundancy, but it permits complete
copies of a collection to be mounted on different file systems for
performance considerations. In particular, the second scheme would
facilitate storing all low-resolution images on high-speed magnetic
disk for fast access, and all high-resolution images on slower, less
expensive storage. This will also facilitate authorizing access to
low-resolution images by other software systems (FTP, Gopher) while
restricting access to high-resolution images.
Turner [Page 9]
RFC 1691 CDL Document Architecture August 1994
Security Considerations
Security issues are not discussed in this memo.
References
[1] Turner, W., "Cornell Digital Library Document Architecture,
Version 1.1 - 3/22/94", Library Technology Department, Cornell
University.
Author's Address
William Turner
Library Technology
502 Olin Library
Cornell University
Ithaca, NY 14853
Phone: 607-255-9098
Fax: 607-255-9346
EMail: wrt1@cornell.edu
Turner [Page 10]
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