Schema History

Version 2.x and higher August 10, 2009
LOC (Library of Congress) becomes maintenance agency for the ALTO standard.
All versions from version 2.0 on will be hosted by LOC.
All information about the newer versions is described on the official ALTO board site at http://www.loc.gov/standards/alto/

Version 1.x publicated and maintained by CCS

Version 1.4 

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August 27, 2007:

1. add "QUALITY_DETAIL" attribute to "PAGE" element (gives more details about the page quality, is a free string compared to QUALITY attribute which is a restrictive one)
2. add "Cover" to "POSITION" attribute of "PAGE" element

Version 1.3 

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1. 1. Adaption of xlink namespace and schema location to prevent conflicts on XSL transformations in combination with used namespace in original METS file

Version 1.2 - 02

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February 24, 2006:

1. ACCURACY attribute added to PAGE element to store information on OCR accuracy
2. CS attribute added to TEXTLINE element to indicate manual correction status

Version 1.1 - 04

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November 19, 2004 (requested by Justin Littman):

1. add "Description" element
2. change "InnerMargin/OuterMargin" to "LeftMargin/RightMargin", add "POSITION" attribute to "PAGE" element
3. add "PROCESSING" attribute to "PAGE" element
4. internal changes to validate with Xerces parser
5. define fontstyles by enumerations
6. change "WC" (word confidence) attribute to xsd:float in range of "0" to "1".
7. Add "ALTERNATIVE" as childs to "STRING" element
8. Add "language" attribute to "Textblock" and "STRING" element

December 02, 2004:

1. fixed problem with multiple use of blockgroup
2. add measurement enumeration 'inch1200'

December 14, 2004:

1. "FILEID" (attribute of "ComposedBlock"): change type from xsd:IDREF to xsd:string
2. include minor changes requested by JDL
3. change "ZORDER" to "IDNEXT" (attribute of "BlockType")

Version 1.0 - 03

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June 22, 2004
Finalized version of docWORKS/METAe working group