pulp

digraph G {
subgraph definition {
node [style=filled,fillcolor="#CCCCCC”];

PulpValue;
    PulpValueList -> PulpValue [dir=both,arrowtail=box];
    PulpValuable -> PulpValue [arrowhead=inv];

PulpField;
    PulpFieldList -> PulpField [dir=both,arrowtail=box];
    PulpKeyList -> PulpField [dir=both,arrowtail=box];
    PulpCriteria -> PulpDefinition [style=dotted];
    PulpCriteria -> PulpCriteriaList [style=dotted,dir=both,arrowtail=box];
    PulpCriteriaList -> PulpCriteria [dir=both,arrowtail=box];
    PulpRelationField -> PulpField [label="2x"];
    PulpRelationFieldList -> PulpRelationField [dir=both,arrowtail=box];
    PulpRelation -> PulpDefinition [style=dotted];
    PulpRelation -> PulpRelationFieldList;
    PulpRelation -> PulpCriteriaList;
    PulpRelationList -> PulpRelation [dir=both,arrowtail=box];
    PulpSortCriteria -> PulpDefinition [style=dotted];
    PulpSortCriteriaList -> PulpSortCriteria [dir=both,arrowtail=box];

PulpDefinitionInterface;
    PulpDefinition -> PulpDefinitionInterface [arrowhead=empty];
    PulpDefinition -> PulpFieldList;
    PulpDefinition -> PulpKeyList;
    PulpDefinition -> PulpField;
    PulpDefinition -> PulpRelationList;
    PulpDefinition -> PulpSortCriteriaList;

PulpSequenceDefinition -> PulpKeyList;

PulpFlag -> PulpDefinition;
    PulpFlag -> PulpFlag [dir=both,arrowtail=box];
  }

subgraph connection {
    node [style=filled,fillcolor="#CCCCCC"];
    PulpConnection;
    PulpFunctions -> PulpValueList [arrowhead=inv];
    PulpDataset;
    PulpSession -> PulpConnection;
    PulpSession -> PulpFunctions;
    PulpSession -> PulpDataset [arrowhead=inv];
  } 
}