\input pstricks
\input pst-node
\nopagenumbers
\font\rm=cmss10
\rm

\magnification 500

\font\hl=cmssbx10 at 12pt
\font\big=cmss12
\font\small=cmss8
\hsize=19truecm
\vsize=10truecm
\parindent=0pt

\newdimen\graphwidth
\graphwidth=25cm
\newdimen\graphheight
\graphheight=10cm

\def\hlskip{\vskip 10pt}
\def\hlstrut{\vrule height 13pt depth 4pt width 0pt}

\long\def\entity#1#2{\rnode{#1}{\psframebox{\vbox to 1cm{%
	\vskip 0pt plus 1fil
	\hbox to 4cm{\hss\strut #2\hss}\vskip 0pt plus 0.7fil}}}}
\def\bcolumn{\vbox to 0.8\graphheight\bgroup\hsize=5.2cm}
\def\ecolumn{\egroup}


\hbox to \graphwidth{%
\bcolumn
\centerline{\hl\hlstrut Resources}
\hlskip
\entity{res1}{\big Gaia DR2 timeseries}
\vfil
\entity{res2}{\big GAVO DC TAP}
\vfil
\entity{res3}{\big ivoa.net authority}
\vfil
\entity{res4}{\big ESO obscore}
\ecolumn\hfil
%
\bcolumn
\centerline{\hl\hlstrut Capabilities}
\hlskip
\entity{cap1}{\big Gaia DR2 TS SSAP}
\vfil
\entity{cap2}{\big Gaia DR2 TS Tables}
\vfil
\entity{cap3}{\big Datalink on
Gaia TS}
\vfil
\entity{cap4}{\big GAVO DC TAP}
\ecolumn
\bcolumn
\ecolumn\hfil
%
\bcolumn
\centerline{\hl\hlstrut Interfaces}
\hlskip
\entity{intf1}{\big Gaia DR2 TS SSAP}
\vfil
\entity{intf2}{\big Gaia DR2 TS Browser}
\vfil
\entity{intf3}{\big GAVO TAP no-auth}
\vfil
\entity{intf4}{\big GAVO TAP+auth}
\ecolumn\hfil
%
\bcolumn
\centerline{\hl\hlstrut Endpoints}
\hlskip
\entity{url1}{\big SSAP main site}
\vfil
\entity{url2}{\big SSAP .cl mirror}
\vfil
\entity{url3}{\big TAP main site}
\vfil
\entity{url4}{\big TAP Potsdam mirror}
\ecolumn\hfil

}

\ncdiag[angleA=0, angleB=180]{->}{res1}{cap1}
\ncdiag[angleA=357, angleB=180]{->}{res1}{cap2}
\ncdiag[angleA=354, angleB=180]{->}{res1}{cap3}
\ncdiag[angleA=351, angleB=175, linestyle=dashed]{->}{res1}{cap4}
\ncdiag[angleA=0, angleB=180]{->}{res2}{cap4}

\ncdiag[angleA=0, angleB=180]{->}{cap1}{intf1}
\ncdiag[angleA=355, angleB=180]{->}{cap1}{intf2}
\ncdiag[angleA=5, angleB=180]{->}{cap4}{intf3}
\ncdiag[angleA=0, angleB=180]{->}{cap4}{intf4}

\ncdiag[angleA=0, angleB=180]{->}{intf1}{url1}
\ncdiag[angleA=355, angleB=180]{->}{intf1}{url2}
\ncdiag[angleA=5, angleB=180]{->}{intf4}{url3}
\ncdiag[angleA=0, angleB=180]{->}{intf4}{url4}

\ncline[linestyle=none,arrowsize=3mm]{<-}{res4}{cap4}
\ncline[linestyle=none,arrowsize=3mm]{<-}{cap2}{intf2}
\ncline[linestyle=none,arrowsize=3mm]{<-}{cap3}{intf3}
\ncline[linestyle=none,arrowsize=3mm]{<-}{intf2}{url2}
\ncline[linestyle=none,arrowsize=3mm]{<-}{intf3}{url3}

\vfil\eject
\end