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# Data conversion
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KIK-Starter can convert data from relational or tree-based formats to RDF for query and validation. Currently, KIK-Starter only has a simple demo conversion.
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- Select the conversion tab and the desired conversion
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<img src="uploads/019bcdd2b5dbebfbbe2f6a15090db205/Screenshot_2022-08-22_at_15.29.06.png" width="40%" />
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- Conversions require different numbers of inputs. Optimally, conversions should exactly match standard exports from common system in the sector. This demo requires 6 input files and 2 cussom mapping files
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<img src="uploads/d0005dcdb906bfaf727dae1eae2daf6f/Screenshot_2022-08-22_at_15.29.18.png" width="40%" />
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- Select the 6 input files; you can get demo files [here](uploads/e9bc95660810d1c0f80f645d7bd7d4f7/conversion_demo.zip). Note you can upload multiple files at a time by dragging them in from the Finder/Explorer and KIK-Starter will try intelligently matching them up
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<img src="uploads/6109bea896380d09c9baa2a052b080b6/Screenshot_2022-08-22_at_16.20.19__2_.png" width="60%" />
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- After selecting the 6 input files, download buttons appear next to the two custom mapping files:
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<img src="uploads/a3e0aecad2d044f3847e8724b9861835/Screenshot_2022-08-22_at_16.21.15.png" width="40%" />
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- Clicking either downloads a template Excel file for matching up concepts in the user data to concepts from the ontology. The template contains 4 columns. The first column contains the concepts extracted from the input files and is the only one that should be changed by users. Column contains concepts from the ontology. Columns 3 and 4 are purely descriptive and contains a label for each concept and the available documentation for it.
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- Mapping 1 matches contract names from the input to classes in the ontology. KIK-Starter has tried intelligently matching them up and in this case the proposed mapping is fine
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<img src="uploads/5487fba2596ca41b57ed7cf221ed431b/Screenshot_2022-08-22_at_16.21.52.png" width="60%" />
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- Mapping 2 matches qualification levels to instances from the ontology. KIK-Starter has not matched up Niveau 4 correctly, so we need to manually move it down to the appropriate place
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<img src="uploads/f0c34b448be7d49bbcf50794ffb5f8dc/Screenshot_2022-08-22_at_16.22.22.png" width="60%" />
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- Custom mappings are just added to the conversion like input files. Custom mappings can be reused and only need to be regenerated when the input data start containing concepts not mentioned in the mapping files.
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- After upload, click conversie
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<img src="uploads/9314c460dcde8d42206b9deb343c8578/Screenshot_2022-08-22_at_16.23.00.png" width="40%" />
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- The converted data can be used as any other dataset, so you can proceed with the validatie and query sections above.
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## Custom conversions
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# Advanced query options
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Depending on your user rule, you also have some more advanced options for querying
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