Adjust XML output in GraphML

Question

Do you think I can adjust the xml output from GraphML?

In the GraphML wiki the tags seem to be fixed:

<graphml>
  <graph>
    <node>
      <data></data>
    </node>
    <edge>
      <data></data>
    </edge>
  </graph>
</graphml>

I saw that you can change the tag attributes. Do you think I could customize the tags itself to something like <car></car>?

Paul Sweatte · Answer 1 · 2017-02-24T14:06:50.060

If you need to add new elements, you would have to modify the DTD. In that case, your data would no longer be GraphML, but your own standard due to the DTD customization. Here is the GraphML DTD:

<!-- ====================================================================== -->
<!-- file: graphml.dtd ====================================================== 

  This is the Document Type Definition for the release candidate of 
  GraphML version 1.0 and represents a (necessarily) looser specification 
  than the corresponding XML Schema.  It's use is discouraged, though it
  may be necessary for some systems.

  Usage:

            SYSTEM "http://graphml.graphdrawing.org/dtds/1.0rc/graphml.dtd"

            xmlns="http://graphml.graphdrawing.org/xmlns/1.0rc"

    ====================================================================== -->

<!-- ===============================================================-->
<!--Parameter entity for data content -->
<!--================================================================-->

<!ENTITY % GRAPHML.data.content "(#PCDATA)">

<!-- ===============================================================-->
<!--Parameter entities for attribute list extensions -->
<!--================================================================-->

<!ENTITY % GRAPHML.graphml.attrib "">
<!ENTITY % GRAPHML.locator.attrib "">
<!ENTITY % GRAPHML.graph.attrib "">
<!ENTITY % GRAPHML.node.attrib "">
<!ENTITY % GRAPHML.port.attrib "">
<!ENTITY % GRAPHML.edge.attrib "">
<!ENTITY % GRAPHML.hyperedge.attrib "">
<!ENTITY % GRAPHML.endpoint.attrib "">
<!ENTITY % GRAPHML.key.attrib "">
<!ENTITY % GRAPHML.data.attrib "">
<!ENTITY % GRAPHML.default.attrib "">

<!--============================================================-->
<!--Attributes used by each GRAPHML element-->
<!--============================================================-->

<!ENTITY % GRAPHML.common.attrib
           ""
>

<!--================================================================-->
<!--the graphml elements-->
<!--================================================================-->

<!ELEMENT data  %GRAPHML.data.content;>
<!ATTLIST data 
                key            IDREF   #REQUIRED
                id             ID      #IMPLIED
                %GRAPHML.data.attrib;
                %GRAPHML.common.attrib;
>

<!ELEMENT default  %GRAPHML.data.content;>
<!ATTLIST default 
                %GRAPHML.default.attrib;
                %GRAPHML.common.attrib;
>

<!ELEMENT key (desc?,default?)>
<!ATTLIST key 
              id  ID       #REQUIRED
              for (graph|node|edge|hyperedge|port|endpoint|all) "all"
              %GRAPHML.key.attrib;
              %GRAPHML.common.attrib;
>   

<!ELEMENT graphml  (desc?,key*,(data|graph)*)>
<!ATTLIST graphml  
                   %GRAPHML.graphml.attrib;
                   %GRAPHML.common.attrib;
>

<!ELEMENT graph    (desc?,(((data|node|edge|hyperedge)*)|locator))>
<!ATTLIST graph    
                   id       ID           #IMPLIED
                   edgedefault (directed|undirected) #REQUIRED
                   %GRAPHML.graph.attrib;
                   %GRAPHML.common.attrib;
>   

<!ELEMENT node   (desc?,((((data|port)*,graph?))|locator))>
<!ATTLIST node   
                 id        ID      #REQUIRED
                 %GRAPHML.node.attrib;
                 %GRAPHML.common.attrib;
>

<!ELEMENT port (desc?,(data|port)*)>
<!ATTLIST port
               name    NMTOKEN  #REQUIRED
               %GRAPHML.port.attrib;
               %GRAPHML.common.attrib;
>


<!ELEMENT edge (desc?,data*,graph?)>
<!ATTLIST edge 
               id         ID           #IMPLIED
               source     IDREF        #REQUIRED
               sourceport NMTOKEN      #IMPLIED
               target     IDREF        #REQUIRED
               targetport NMTOKEN      #IMPLIED
               directed   (true|false) #IMPLIED
               %GRAPHML.edge.attrib;
               %GRAPHML.common.attrib;
>

<!ELEMENT hyperedge  (desc?,(data|endpoint)*,graph?)>
<!ATTLIST hyperedge 
                    id     ID      #IMPLIED
                    %GRAPHML.hyperedge.attrib;
                    %GRAPHML.common.attrib;
>

<!ELEMENT endpoint (desc?)>
<!ATTLIST endpoint 
                   id    ID       #IMPLIED
                   node  IDREF    #REQUIRED
                   port  NMTOKEN  #IMPLIED
                   type  (in|out|undir) "undir"
                   %GRAPHML.endpoint.attrib;
                   %GRAPHML.common.attrib;
>

<!ELEMENT locator EMPTY>
<!ATTLIST locator 
                   xmlns:xlink   CDATA   #FIXED  "http://www.w3.org/TR/2000/PR-xlink-20001220/"
                   xlink:href     CDATA    #REQUIRED
                   xlink:type     (simple) #FIXED    "simple"
                   %GRAPHML.locator.attrib;
                   %GRAPHML.common.attrib; 
>

<!ELEMENT desc (#PCDATA)>
<!ATTLIST desc %GRAPHML.common.attrib;>

References

Comparison between XML to SVG Transformation Mechanisms

Adjust XML output in GraphML

1 Answers1