However, there's a free commandline tool available for unix systems that can convert from djvu to one of the text based format that Greenstone can process, text or html. The conversion tool will be launched with the command provided, and the expected output files as specified can then be processed by Greenstone in the usual manner.Īn example would be djvu files, for which Greenstone provides no custom plugin. Once configured, the UnknownConverterPlugin will be used during building to process documents that match the specified file format. In place of the input file and the output file or folder you provide placeholders in the command to run. If you know how to launch this tool from the commandline to do the conversion, then you would configure the UnknownConverterPlugin by supplying the file format (file extension) of the documents it should process, the expected output file format (text, html or paged images), and the tool's conversion command that the UnknownConverterPlugin should launch to perform the conversion. The UnknownConverterPlugin extends the UnknownPlugin's abilities by letting you launch a tool you have installed on your own operating system that can be run from the commandline to convert from the "unknown" file format to either text, html or gif/jpg/png images, or a folder of these. It can also be made to handle documents with known file extensions in a custom manner. The UnknownConverterPlugin builds on the idea of the UnknownPlugin, in that it can be configured to handle documents of unknown format and file extension. Using the UnknownConverterPlugin to make unsupported document formats searchable If you have a great many documents and do not want the OAI server to return all of them in one go, you could set the property to something lower than the default 250 value in the oai.cfg file. Oaicollection demo documented-examples/oai-e backdrop Therefore, add this collection's name to the end of the property: Select this plugin in the list, then use the button to shift it upwards until it comes just after the GreenstoneXMLPlugin.įor this tutorial, we'll make the backdrop collection created in the simple image tutorial available over OAI. Press the button, and then click to add it to the plugin list. In the section of the panel, go down to the and choose the. Select this plugin in the list, then use the button to shift it upwards until it comes just after the GreenstoneXMLPlugin. Press the Add Plugin button, and then click to add it to the plugin list. In the section of the panel, go down to the select plugin to add and choose the. We can extract this metadata when the collection is built, and in particular, make use of the GPS metadata to provide map-based views of the collection to the user. This will create a classifier labelled locations that groups all images under Eiffel Tower into one bookshelf and similarly creates bookshelves for the other 3 categories.Įach of these image files has metadata embedded in it-including GPS data-generated by the smartphone when the photo was taken. In the configuration dialog that appears, set the metadata field to dc.Title and tick the buttonname option and set its value to locations. In the Browsing Classifiers section, choose AZCompactList from the dropdown box and press. This will create a classifier labelled locations that groups all images under Eiffel Tower into one bookshelf and similarly creates bookshelves for the other 3 categories. In the Browsing Classifiers section, choose AZCompactList from the select classifier to add dropdown box and press Add Classifier.
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