Graphical description language graphml (1): Basic Concepts

GraphmlUsed to define graphics (Graph),For the following simple image,

Graphml is described as follows:

<? XML version = "1.0" encoding = "UTF-8" ?>
< Graphml Xmlns = "Http://graphml.graphdrawing.org/xmlns"
Xmlns: xsi = "Http://www.w3.org/2001/XMLSchema-instance"
Xsi: schemalocation = "Http://graphml.graphdrawing.org/xmlns
Http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd" >
< Graph ID = "G" Edgedefault = "Undirected" >
< Node ID = "N0" />
< Node ID = "N1" />
< Node ID = "N2" />
< Node ID = "N3" />
< Node ID = "N4" />
< Node ID = "N5" />
< Node ID = "N6" />
< Node ID = "N7" />
< Node ID = "N8" />
< Node ID = "Success" />
< Node ID = "N10" />
< Edge Source = "N0" Target = "N2" />
< Edge Source = "N1" Target = "N2" />
< Edge Source = "N2" Target = "N3" />
< Edge Source = "N3" Target = "N5" />
< Edge Source = "N3" Target = "N4" />
< Edge Source = "N4" Target = "N6" />
< Edge Source = "N6" Target = "N5" />
< Edge Source = "N5" Target = "N7" />
< Edge Source = "N6" Target = "N8" />
< Edge Source = "N8" Target = "N7" />
< Edge Source = "N8" Target = "Success" />
< Edge Source = "N8" Target = "N10" />
</ Graph >
</ Graphml >

 

It can be seen that some basic concepts about graphics in graphml are as follows:

Note the following:

1. GraphElement in(Element)No order requirements

For example, the followingGraphIs correct:

< Graph ID = "G" Edgedefault = "Directed" >
< Node ID = "N0" />
< Edge Source = "N0" Target = "N2" />
< Node ID = "N1" />
< Node ID = "N2" />
</ Graph >

2. directed Graphs and undirected graphs can be mixed and defined.

graph medium required specify edgedefault

Attribute
 

(

 
"
 

Directed"

Or"
 

Undirected ")

 
,
 

Edge

You can also set it separately.
 

Directed

 
Is
 

True

Or
 

False

 
.
 

3. For scenarios with only one endpoint(Endpoint) OfEdge ( Called cyclic edgeLoop edge, Self-LoopSelfloop edge, Or reflection sideReflexive edig ), YesEdge OfSource AndTarget Set the same attribute value to define.