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gt-labelling : semantic-labelling OCR ground truth data

Semantic-labelling OCR ground truth data and store these data with METS metadata set.

Use the XSD Schema in METS

Namespace and schema location

Add the namespace http://www.ocr-d.de/GT/. We recommend gt as namespace prefix:

xmlns:gt="http://www.ocr-d.de/GT/"

Set XSD schema location OCR-D_GT_schema.xsd:

xsi:schemaLocation="file:///OCR-D_GT_schema.xsd" or URL...

METS Example

See mets_example.xml.

Developer info

The ontology is defined in DefaultLabelTypes_3.xml taken from https://github.com/PRImA-Research-Lab/semantic-labelling

The XSD is generated by transforming that ontology with an XSLT stylesheet.

java -jar ../saxon9he.jar -xsl:OCR-D_GT_labelschema_maker.xsl -s:DefaultLabelTypes_3.xml

Acknowledgements

Ontology described in

Clausner, C and Antonacopoulos: Ontology and framework for semantic labelling of document data and software methods in: 13th IAPR International Workshop on Document Analysis Systems (DAS2018), 24-27 April 2018, Vienna, Austria. http://usir.salford.ac.uk/46896/

Implemented as a set of Java tools in https://github.com/PRImA-Research-Lab/semantic-labelling

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