Should we necessarily use blank nodes?

[candlecao]

First of all, I agree to use blank nodes wherever it's necessary.
This topic regards several points:

1. Some existing issues

#118

at the bottome of the issue, we encounter this question

In addition, in the sets.csv file of The Session Database, I also encounter situation where blanks nodes are applicable:

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tuneset_id	name	tune_id	setting_id	type	type_wiki
https://thesession.org/members/128154/sets/22927	Rakes Of Mallow, The	https://thesession.org/tunes/85	12595	polka	https://www.wikidata.org/wiki/Q153071
https://thesession.org/members/128154/sets/22927	My Darling Asleep	https://thesession.org/tunes/76	76	jig	https://www.wikidata.org/wiki/Q1079270
https://thesession.org/members/128154/sets/22927	Drops Of Brandy, The	https://thesession.org/tunes/388	388	jig	https://www.wikidata.org/wiki/Q1079270
https://thesession.org/members/128154/sets/22927	Fanny Power	https://thesession.org/tunes/957	957	waltz	https://www.wikidata.org/wiki/Q8701407
https://thesession.org/members/128154/sets/22927	Brian Boru's March	https://thesession.org/tunes/271	13010	jig	https://www.wikidata.org/wiki/Q1079270
https://thesession.org/members/128154/sets/22927	Saint Patrick's Day	https://thesession.org/tunes/385	13216	jig	https://www.wikidata.org/wiki/Q1079270
https://thesession.org/members/128154/sets/22927	Planxty Irwin	https://thesession.org/tunes/790	13930	waltz	https://www.wikidata.org/wiki/Q8701407
https://thesession.org/members/128154/sets/22927	Irish Washerwoman, The	https://thesession.org/tunes/92	21778	jig	https://www.wikidata.org/wiki/Q1079270
https://thesession.org/members/128154/sets/22927	Tenpenny Bit, The	https://thesession.org/tunes/109	27514	jig	https://www.wikidata.org/wiki/Q1079270
https://thesession.org/members/128154/sets/22927	S铆 Bheag S铆 Mh贸r	https://thesession.org/tunes/449	28390	waltz	https://www.wikidata.org/wiki/Q8701407
https://thesession.org/members/128154/sets/22927	Tabhair Dom Do L谩mh	https://thesession.org/tunes/454	31867	waltz	https://www.wikidata.org/wiki/Q8701407
https://thesession.org/members/128154/sets/22927	Planxty Hewlett	https://thesession.org/tunes/1468	32625	waltz	https://www.wikidata.org/wiki/Q8701407

@Yueqiao12Zhang We may talk about this. > https://github.com//issues/95

[candlecao]

2. What if we use blank nodes, our python code for CSV2RDF probably have to be modified, I think. @Yueqiao12Zhang

Unless we modify the structure of CSVs for any given database, for example, using json in a cell for a attribute.

3. There may be “relation sets” in addition to “entity sets” in a relational database. As long as a relational database inevitably uses relation sets (and each relation set having its own unique attributes), it becomes necessary to use blank nodes in terms of converting the relational database into RDF database. Furthermore, a relation set may have a composite primary key composed of multiple fields, a scenario that our current code does not yet accommodate.

[fujinaga]

I prefer using named graphs. To be discussed further. Remember that I value provenance of each statement.

[candlecao]

I prefer using named graphs. To be discussed further. Remember that I value provenance of each statement.

Hi Ich, I should take some time to look into how to use named graph to solve the issue practically.

[fujinaga]

Yes, please.