  In this paper, we analyze a major part of the research output of the
Networked Knowledge Organization Systems (NKOS) community in the period 2000 to
2016 from a network analytical perspective. We focus on the papers presented at
the European and U.S. NKOS workshops and in addition four special issues on
NKOS in the last 16 years. For this purpose, we have generated an open dataset,
the "NKOS bibliography" which covers the bibliographic information of the
research output. We analyze the co-authorship network of this community which
results in 123 papers with a sum of 256 distinct authors. We use standard
network analytic measures such as degree, betweenness and closeness centrality
to describe the co-authorship network of the NKOS dataset. First, we
investigate global properties of the network over time. Second, we analyze the
centrality of the authors in the NKOS network. Lastly, we investigate gender
differences in collaboration behavior in this community. Our results show that
apart from differences in centrality measures of the scholars, they have higher
tendency to collaborate with those in the same institution or the same
geographic proximity. We also find that homophily is higher among women in this
community. Apart from small differences in closeness and clustering among men
and women, we do not find any significant dissimilarities with respect to other
centralities.
