Eea.sparql

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* Bug fix: fixed "add new argument" CSS
[ghicaale refs 20945]

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* Feature: added a howto for building Sparqls with arguments
[pasoviul refs 19537]
* Feature: changed dropdown values to labels insted of URIs
[pasoviul refs 19537]
* Bug fix: fixed error on 'Test and preview query'
[pasoviul refs 19537]
* Bug fix: fixed argument handling between sparq and ZSPARQL
[pasoviul refs 19537]
* Change: updated sparqls to provide queries for arguments, besides names and types
[pasoviul refs 19537]
* Bug fix: fixed documentation generated by Jenkins
[ghicaale refs 19537]

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* Feature: removed "Caching" action. We are now using the more complex "Cache"
action registered by eea.cache
[ghicaale refs 21143]
* Feature: added upgrade step to remove absolete "Caching" action
[ghicaale refs 21143]

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* Bug fix: Fixed html, csv, tsv and exhibit json exports
[pasoviul refs 19537]

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* Change: Cleanup memcache invalidation code as it's already handled by
eea.cache (7.0+)
[voineali refs 20678]

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* Bug fix: removed wrongly added blockquotes within README.rst
[ichim-david refs 18064]
* Feature: adding Sphinx-generated documentation in Page Template format
[batradav refs 9502]