rdf2dot

A commandline tool for drawing RDF graphs in Graphviz DOT format

You can draw the graph of an RDF file directly:

rdf2dot my_rdf_file.rdf | dot -Tpng | display

Functions:

• main –
• rdf2dot –

  Convert the RDF graph to DOT

Attributes:

• EDGECOLOR –
• ISACOLOR –
• LABEL_PROPERTIES –
• NODECOLOR –
• XSDTERMS –

EDGECOLOR module-attribute

EDGECOLOR = 'blue'

ISACOLOR module-attribute

ISACOLOR = 'black'

LABEL_PROPERTIES module-attribute

LABEL_PROPERTIES = [label, URIRef('http://purl.org/dc/elements/1.1/title'), URIRef('http://xmlns.com/foaf/0.1/name'), URIRef('http://www.w3.org/2006/vcard/ns#fn'), URIRef('http://www.w3.org/2006/vcard/ns#org')]

NODECOLOR module-attribute

NODECOLOR = 'black'

XSDTERMS module-attribute

XSDTERMS = [(XSD[x]) for x in ('anyURI', 'base64Binary', 'boolean', 'byte', 'date', 'dateTime', 'decimal', 'double', 'duration', 'float', 'gDay', 'gMonth', 'gMonthDay', 'gYear', 'gYearMonth', 'hexBinary', 'ID', 'IDREF', 'IDREFS', 'int', 'integer', 'language', 'long', 'Name', 'NCName', 'negativeInteger', 'NMTOKEN', 'NMTOKENS', 'nonNegativeInteger', 'nonPositiveInteger', 'normalizedString', 'positiveInteger', 'QName', 'short', 'string', 'time', 'token', 'unsignedByte', 'unsignedInt', 'unsignedLong', 'unsignedShort')]

main

main()

Source code in rdflib/tools/rdf2dot.py

def main():
    rdflib.extras.cmdlineutils.main(rdf2dot, _help)

rdf2dot

rdf2dot(g: Graph, stream: TextIO, opts: Dict[str, Any] = {})

Convert the RDF graph to DOT writes the dot output to the stream

Source code in rdflib/tools/rdf2dot.py

def rdf2dot(g: Graph, stream: TextIO, opts: Dict[str, Any] = {}):
    """
    Convert the RDF graph to DOT
    writes the dot output to the stream
    """

    fields = collections.defaultdict(set)
    nodes: Dict[Node, str] = {}

    def node(x: Node) -> str:
        if x not in nodes:
            nodes[x] = "node%d" % len(nodes)
        return nodes[x]

    def label(x: Node, g: Graph):
        for labelProp in LABEL_PROPERTIES:  # noqa: N806
            l_ = g.value(x, labelProp)
            if l_:
                return l_
        try:
            # type error: Argument 1 to "compute_qname" of "NamespaceManager" has incompatible type "Node"; expected "str"
            return g.namespace_manager.compute_qname(x)[2]  # type: ignore[arg-type]
        except Exception:
            return x

    def formatliteral(l: Literal, g):  # noqa: E741
        v = html.escape(l)
        if l.datatype:
            return ""%s"^^%s" % (v, qname(l.datatype, g))
        elif l.language:
            return ""%s"@%s" % (v, l.language)
        return ""%s"" % v

    def qname(x: URIRef, g: Graph) -> str:
        try:
            q = g.compute_qname(x)
            return q[0] + ":" + q[2]
        except Exception:
            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"
            )
            # type error: Argument 1 to "qname" has incompatible type "Node"; expected "URIRef"
            stream.write(opstr % (sn, on, color(p), qname(p, g)))  # type: ignore[arg-type]
        else:
            # type error: Argument 1 to "qname" has incompatible type "Node"; expected "URIRef"
            fields[sn].add((qname(p, g), formatliteral(o, g)))  # type: ignore[arg-type]

    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
            # type error: Value of type variable "AnyStr" of "escape" cannot be "Node"
            % (n, NODECOLOR, html.escape(label(u, g)), u, html.escape(u), "".join(f))  # type: ignore[type-var]
        )

    stream.write("}\n")