All predicatesShow sourcerdf_graphviz.pl -- Interface to graphviz for RDF graphs

Graphviz is a general purpose graph vizualization library. Its home-page is http://www.graphviz.org/ This module translates an RDF graph represented as a list of rdf(S,P,O) into a .dot file.

author
- Jan Wielemaker
Source gviz_write_rdf(+Stream, +Graph, +Options) is det
Write the graph Triples to Stream in dot compatible format. Options:
graph_attributes(+Attributes)
Additional overall graphs attributes for dot. Each attribute is of the format Name(Value) and written as Name="Value". The term size(W,H) is accepted as well.
max_label_length(+Len)
Truncate labels to Len characters. Default is 25. Use inf to print the full label.
lang(+Lang)
Lang is the language used for the labels. See resource_label/4.
smash(+Properties)
Smash networks connected by one of the given properties. Currently only [owl:sameAs].
bags(Bags)
How to handle bags. Values are
graph
Show as normal nodes (i.e. handles as normal RDF)
merge(Shape, Max)
Put the members in a dot node using Shape. Only place the first Max members and add a note stating '... showing N of M' to indicate the actual number
edge_links(+Boolean)
If false (default true) do not put href atributes on edges.
wrap_url(:Goal)
If present, URLs of the graph are replaced with the result of call(Goal, URL0, URL)
edge_hook(:Goal)
Called to define the attributes for a link as call(Goal, URI, Attributes, Options). Attributes is a list of Name(Value) terms. See edge_attributes/3.
shape_hook(:Goal)
Called to define the shape of a resource as call(Goal, URI, Shape, Options). Shape is a list of Name(Value) terms. See shape/3.
bag_shape_hook(:Goal)
Called to define the shape parameters for a bag (Table). called as call(Goal, Members, Shape) Shape is a list of Name(Value) terms.
label_hook(:Goal)
Called to define the label of a resource as call(Goal, URI, Language, MaxLength, Label). Label is an atom.
target(Target)
If present, add target=Target to all attribute lists that have an href attribute.
display_lang(+Boolean)
Display the language of literal nodes, defaults to true.
Source write_graph_attributes(+List, +Out)[private]
Write attributes for the graph as a whole
Source combine_bags(+Graph, -Triples, -Bags, +Options) is det[private]
Seperate the bags from the graph. Triples represent the remaining graph (in which a bag is a single node) and Bags is an assoc BagID-Members storing the members of the bags.
Source bagid_property(+P, -I) is semidet[private]
True if P is of the format _:N, where N is a non-negative integer.
Source smash_graph(+GraphIn, -GraphOut, +Options)[private]
Smash networks of equivalent properties.
Source smash_on_property(+P, +GraphIn, -GraphOut)[private]
Merge owl:sameAs nodes, replacing the node with a bag.
Source gv_write_edges(+Graph, -Done, +Stream, +Options) is det[private]
Write the edges of an RDF graph in dot format. It invents a dot identifier for each node as it processes the nodes. The mapping from node to dot identifier is returned in the assoc Done.
Source gv_write_nodes(+Nodes:list(pair), +Stream, +Options)[private]
Write information about the nodes, defining the share and label of the node.
Source write_node_attributes(+RDF, +Stream, +Options) is det[private]
Write attributes for an RDF node. The node identifier matching the declared edges is alreadu written to Stream.
Source bag_label(+Members, +Max, -Label, +Options) is det[private]
Create an HTML description for describing a bag of objects.
Arguments:
Max- is the maximum # members to show. If there are more, a text "... showing N of M" is displayed.
Label- is a Prolog packed string with HTML text.
Source write_image_node(+ImgAttrs, +Attrs, +Stream, +Options) is det[private]
Render a node using an image. The image location is either an external URL or a local file specification using the notation icons(File), a term that must resolve in an image file using absolute_file_name/3. In the default setup, this means that the image must be in the directory web/icons of a package.
Source resource_label(+Resource, -Label:atom, +Options) is det[private]
Label is the textual label to show for Resource. Process the options
  • lang(+Lang)
  • max_label_length(+Len)
Source write_attributes(+Attributes:list, +Out:stream) is det[private]
Write attribute values. We define some special attributes:
html(HTML)
Emit as label=<HTML>
Source filter_attributes(+AllAttrs, +Element, -ForElement, -Rest) is det[private]
Source gv_attr(?AttrName, ?Element, ?Type) is nondet[private]
Name and type-declarations for GraphViz attributes. Types are defined my must_be/2.
See also
- http://www.graphviz.org/doc/info/shapes.html
Source cstring(+Codes)//[private]
Create a C-string. Normally dot appears to be using UTF-8 encoding. Would there be a safer way to transport non-ascii characters, such as \uXXXX?
Source bag_shape(+Members, -BagShape, +Options) is det[private]
Compute parameters for a bag of resources.
Source shape(+Resource, -Attributes, +Options) is det[private]
Shape is the shape of the node to use for Resource. Shapes can be modified in two ways:
  • through the option shape_hook(Closure), which must return a valid Attributes list for GraphViz
  • By addings sub-properties of graphviz:styleParameter to the class of the resource. The value of this property defines the attribute value, while the label defines the attribute-name.
Source edge_attributes(+Triple, -Attributes, +Options) is det[private]
Arguments:
Triple- is a term rdf(S,P,O).
Source cached_image_in_svg(+Request)[private]
HTTP handler to serve an image we have included in an SVG file.
To be done
- Should we restrict files served to files that are part of recently served SVG files?