Source code for

A commandline tool for drawing RDF graphs in Graphviz DOT format

You can draw the graph of an RDF file directly:

.. code-block: bash

   rdf2dot my_rdf_file.rdf | dot -Tpng | display


import collections
import html
import sys

import rdflib
import rdflib.extras.cmdlineutils
from rdflib import XSD


    for x in (

EDGECOLOR = "blue"
NODECOLOR = "black"
ISACOLOR = "black"

[docs]def rdf2dot(g, stream, opts={}): """ Convert the RDF graph to DOT writes the dot output to the stream """ fields = collections.defaultdict(set) nodes = {} def node(x): if x not in nodes: nodes[x] = "node%d" % len(nodes) return nodes[x] def label(x, g): for labelProp in LABEL_PROPERTIES: l_ = g.value(x, labelProp) if l_: return l_ try: return g.namespace_manager.compute_qname(x)[2] except: return x def formatliteral(l, g): v = html.escape(l) if l.datatype: return "&quot;%s&quot;^^%s" % (v, qname(l.datatype, g)) elif l.language: return "&quot;%s&quot;@%s" % (v, l.language) return "&quot;%s&quot;" % v def qname(x, g): try: q = g.compute_qname(x) return q[0] + ":" + q[2] except: return x def color(p): return "BLACK" stream.write('digraph { \n node [ fontname="DejaVu Sans" ] ; \n') for s, p, o in g: sn = node(s) if p == rdflib.RDFS.label: continue if isinstance(o, (rdflib.URIRef, rdflib.BNode)): on = node(o) opstr = ( "\t%s -> %s [ color=%s, label=< <font point-size='10' " + "color='#336633'>%s</font> > ] ;\n" ) stream.write(opstr % (sn, on, color(p), qname(p, g))) else: fields[sn].add((qname(p, g), formatliteral(o, g))) for u, n in nodes.items(): stream.write("# %s %s\n" % (u, n)) f = [ "<tr><td align='left'>%s</td><td align='left'>%s</td></tr>" % x for x in sorted(fields[n]) ] opstr = ( "%s [ shape=none, color=%s label=< <table color='#666666'" + " cellborder='0' cellspacing='0' border='1'><tr>" + "<td colspan='2' bgcolor='grey'><B>%s</B></td></tr><tr>" + "<td href='%s' bgcolor='#eeeeee' colspan='2'>" + "<font point-size='10' color='#6666ff'>%s</font></td>" + "</tr>%s</table> > ] \n" ) stream.write( opstr % (n, NODECOLOR, html.escape(label(u, g)), u, html.escape(u), "".join(f)) ) stream.write("}\n")
def _help(): sys.stderr.write( """ [-f <format>] files... Read RDF files given on STDOUT, writes a graph of the RDFS schema in DOT language to stdout -f specifies parser to use, if not given, """ )
[docs]def main(): rdflib.extras.cmdlineutils.main(rdf2dot, _help)
if __name__ == "__main__": main()