linked data open data open data support metadata ods psi uri rdf semantic web license rdf vocabulary polish open government data données liées government sparql open data quality lithuania data quality government data data management creative commons licenses european union european commission psi directive data gove service desription german open data lifecycle high value data public sector information latvia pan-european data portal public domain vocabulary persistence metad lifecycle dcat interoperability product lifecycle management mana odip gnu general public license uniform resource identifier joinup rdfs
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