• • GraphML graph data format.
  • Standard exchange for graphs.
  • GraphML is an acronym derived from Graph Markup Language.
  • XML-based format.
  • Represents typed, attributed, directed, and undirected graphs.
  • Can also store nested graphs and hypergraphs.
  • Supports user-defined edge and vertex types.
  • Proposed by the GraphML working group in 2001.

• Import ["file.graphml"] imports the graphs stored in the specified file, given as a single Graph object or a list of graphs.
• Export ["file.graphml",expr] exports an adjacency matrix or edge information for one graph or for multiple graphs to the GraphML format.
• Import ["file.graphml",elem] imports the specified element from a GraphML file.
• Import ["file.graphml",{elem,sub_a,sub_b,…}] imports a subelement.
• Import ["file.graphml",{{elem₁,elem₂,…}}] imports multiple elements.
• The import format can be specified with Import ["file","GraphML"] or Import ["file",{"GraphML",elem,…}].
• Export ["file.graphml",expr,elem] creates a GraphML file by treating expr as specifying element elem.
• Export ["file.graphml",{expr₁,expr₂,…},{{elem₁,elem₂,…}}] treats each expr_i as specifying the corresponding elem_i.
• Export ["file.graphml",expr,opt₁->val₁,…] exports expr with the specified option elements taken to have the specified values.
• Export ["file.graphml",{elem₁->expr₁,elem₂->expr₂,…},"Rules"] uses rules to specify the elements to be exported.
• See the following reference pages for full general information:
• Import , Export import from or export to a file
  CloudImport , CloudExport import from or export to a cloud object
  ImportString , ExportString import from or export to a string
  ImportByteArray , ExportByteArray import from or export to a byte array

• General Import elements:
• "Elements" list of elements and options available in this file
  "Summary" summary of the file
  "Rules" list of rules for all available elements
• Data representation elements:
• "AdjacencyMatrix" edge information, given as a list of matrices
  "EdgeAttributes" edge attributes, represented as a list of rules
  "EdgeLabels" list of strings representing edge labels
  "EdgeRules" connectivity data for all graphs, given as an array of rules
  "Graph" first graph stored in the file, given as a Graph object
  "Graphics" first graph stored in the file, rendered as a graph plot
  "GraphicsList" all graphs given as a list of graphics objects
  "GraphList" all graphs stored in the file, given as a list of Graph objects
  "VertexAttributes" vertex attributes, represented as a list of rules
  "VertexCount" number of vertices in each graph, given as a list of integers
  "VertexList" vertices, given as a list of strings
• Import by default uses "Graph" for simple GraphML files and "GraphList" for multigraph GraphML files.
• Element specifications for GraphML files containing multiple graphs:
• "GraphNames" names of the graphs, given as a list of strings
  elem,"name" element elem for the graph specified by "name"
  elem,n data representation element elem for the n^(th) graph in this file
  elem,{n₁,n₂,…} element elem for graphs n₁, n₂, …
  elem,All element elem for all graphs, given as a list

• General Import options:
• ImageSize Automatic specifies the overall size of the image to display for a graph
• When importing from GraphML, all options supported by Graph can be given. Common settings include:
• EdgeLabels Automatic labels and label placement for edge
  EdgeWeight Automatic weight for edge
  VertexCoordinates Automatic center coordinate for vertex
  VertexLabels Automatic labels and label placement for vertex
  VertexShape Automatic graphic shape for vertex
• When importing "Graphics", all options supported by GraphPlot can be given. Common settings include:
• DirectedEdges Automatic whether to show edges as directed arrows
  EdgeLabels Automatic whether to include labels given for edges
  EdgeShapeFunction Automatic function to give explicit graphics for edges
  VertexLabels Automatic whether to show vertex names as labels
  VertexShapeFunction Automatic function to give explicit graphics for vertices
• When exporting from a Graph object, Wolfram Language graph attribute values are often exported as strings using Compress .

Basic Examples  (7)

Scope  (1)