Nathan Katz

Who is Nathan Katz?

Nathan Katz: The Hague. Dealer. Sold to all the Germans...
source: Interrogations: Miedl Case (Alois Miedl)Restitution Research Records NARA M1946
https://www.fold3.com/image/270014556

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If one googles Nathan Katz, Wikipedia pages for a  professor and a poet of this name will appear. But if one is searching for the Dutch art dealer, one must look further. Katz is a very common name, and confusion is a problem. In this post we attempt to bring together a few elements to help identify Nathan Katz the art dealer, who owned the  Dutch dealership Firma D. Katz in Dieren, Netherlands.

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Nathan Katz: Art Market Network according to the 1946 Art Looting Investigation Unit Red Flag Names

"Katz, Nathan. The Hague, Lange Voorhuit 35 Dieren, bei Arnhem. Prominent dealer. Worked principally with Hofer, Posse and Miedl, as well as Lange, Haberstock, Boehler and other German buyers. Two brothers in the Western Hemisphere: Benjamin Katz, Hotel Dauphin, New York and Abraham Katz, 18 Pietermaai, Wilhelmstad, Curacao."

Amazing Wikidata Timelines

Wikidata has timelines built into its queries. (See above for "People who died by burning")

First of all, this is incredible and amazing and insanely powerful.

Art Dealers and Art Historians: Authorities Identifiers by the Numbers

Linked Open Data queries need authoritative identifiers to work across platforms.

QUESTION: Which are the most used identifiers for art dealers, art historians, art dealers and art collectors who exist in Wikidata?

Below are Wikidata Sparql Queries that show the authorities that are most used for referencing art dealers and art historians in Wikidata.

(VIAF wins hands down.) 

ART DEALERS : VIAF, LCCN, RKD...




ART HISTORIANS





ART COLLECTORS











Wikidata Query for Most Used Identifiers for Art Dealers

SELECT ?propertyLabel ?propertyDescription ?count WHERE {
{
SELECT ?propertyclaim (COUNT(*) AS ?count) WHERE {
?item wdt:P106 wd:Q173950.
?item wdt:P31 wd:Q5.
?item ?propertyclaim _:b2.
}
GROUP BY ?propertyclaim
}
?property wikibase:propertyType wikibase:ExternalId.
?property wdt:P31 wd:Q19595382.
?property wikibase:claim ?propertyclaim.
SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
}
ORDER BY DESC(?count)
LIMIT 100

Art Dealers, with gender, a Wikidata Query

List of art dealers (with gender) in Wikidata

Publishing open linked data: Tableminer and Austrian data portals

In this interesting paper, Tomas Knap looks at using Tableminer+ to help transform CSV files from Austrian data portals,  http://www.data.gv.at and http://www.opendataportal.at, into Linked Open Data.

Quote

"To leverage CSV files to Linked Data3 , it is necessary to 1) classify CSV columns based on its content and context against existing knowledge bases 2) assign RDF terms (HTTP URLs, blank nodes and literals) to the particular cell values according to Linked Data principles (HTTP URL identifiers may be reused from one of the existing knowledge bases), 3) discover relations between columns based on the evidence for the relations in the existing knowledge bases, and 4) convert CSV data to RDF data properly using data types, language tags, well-known Linked Data vocabularies, etc" - 

from: "Increasing Quality of Austrian Open Data by Linking them to Linked Data Sources: Lessons Learned?" by Tomas Knap, Charles University in Prague, Faculty of Mathematics and Physics,  Czech Republic, Semantic Web Company, Vienna, Austria
Read more: at http://ceur-ws.org/Vol-1585/ldq2016_paper_01.pdf

Preserving Digital Objects

How to ensure preservation and access for digital objects? 

The California Digital Library has published guidelines that aim to support the following objectives:

• Ensure a basic level of uniformity in the structure and encoding of non-licensed digital content managed by the CDL

• Advance interoperability among digital content from diverse institutions

• Promote efficient ingest procedures

• Support the orderly management of digital content

• Facilitate access to digital content by users

• Minimize costs 

To consult the PDF of  CDL Guidelines for Digital Objects (CDL GDO) Maintained by the California Digital Library (January 2017 University of California, California Digital Library)

For more information on Calisphere/DAMS Projects