GML Parser for Graphs

Example for GML Format

 
# This is a comment.
graph [ # Lists start with '['.
  directed 1 # This is a directed graph (0 for undirected).
  
  # The following is an object of type string.
  # It will be ignored unless you specify a rule for graph.text.
  text "This is a string object."
  
  node [ id 1 ] # This defines a node with id 1.
  node [ id 2 ]
  node [ id 3 ]
  
  edge [ # This defines an edge leading from node 1 to node 2. 
    source 1
    target 2
  ]
  edge [
    source 2
    target 3
  ]
  edge [
    source 3
    target 1
  ]
] # Lists end with ']'.

The data type graph provides functions to read and write graphs in GML format. These functions use the data type GML parser for Graphs.

It is also possible to use the GML parser for Graphs directly. It provides easy to use means to extend and adapt it for special needs.

Example of how to use GML format and native graph file format

Strength

• Powerful and easy to use

Disadvantage

• (Significantly) slower than native file format for graphs

Tips

• If you need to store your graphs with additional information and readability of the resulting files is an issue, consider using the GML format and the GML parser for Graphs.

See also:

Native File Format for Graphs

Graphs and Related Data Types

Manual Entries:

GML parser for Graphs