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Sigma knowledge engineering system is an system for developing, viewing and debugging theories in first order logic. It works with Knowledge Interchange Format (KIF) and is optimized for the Suggested Upper Merged Ontology (SUMO) www.ontologyportal.org.

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package TPTPWorld;

import tptp_parser.SimpleTptpParserOutput;

import java.util.ArrayList;

public class TPTPFormula {
  public int id;
  public String type = "";
  public SimpleTptpParserOutput.TopLevelItem item;
  public SimpleTptpParserOutput.Annotations annotations = null;
  public SimpleTptpParserOutput.Source source = null;
  public ArrayList parent;
  public ArrayList child;

  public TPTPFormula (SimpleTptpParserOutput.TopLevelItem item, int id) {
    this.item = item;
    this.id = id;
    type = TPTPParser.getType(item);
    parent = new ArrayList();
    child = new ArrayList();
    
    if (item.getKind() == SimpleTptpParserOutput.TopLevelItem.Kind.Formula) {
      SimpleTptpParserOutput.AnnotatedFormula AF = ((SimpleTptpParserOutput.AnnotatedFormula)item);
      annotations = AF.getAnnotations();
    } else if (item.getKind() == SimpleTptpParserOutput.TopLevelItem.Kind.Clause) {
      SimpleTptpParserOutput.AnnotatedClause AC = ((SimpleTptpParserOutput.AnnotatedClause)item);
      annotations = AC.getAnnotations();
    } 
    if (annotations != null) {
      source = annotations.getSource();
    }
  }

  public void addParent (TPTPFormula that) {
      if (that != null) {
	  this.parent.add(that);
	  that.child.add(this);
      } else {
	//  System.out.println("%WARNING: Trying to add parent null to "+this.toString());
      }
  }

  // given a cnf formula, turn it into an fof formula (universally quantify all variables)  
  public String fofify () {
    String UniversalQuantifier = "!";
    String res = "";
    if (item.getKind() == SimpleTptpParserOutput.TopLevelItem.Kind.Formula) {
      SimpleTptpParserOutput.AnnotatedFormula AF = ((SimpleTptpParserOutput.AnnotatedFormula)item);
      res += "fof(";
      res += TPTPParser.getName(item) + ",";
      res += AF.getRole().toString();
      res += ",(" + "\n";
      res += "    " + AF.getFormula().toString(4);
      res += " )).";      
    } else if (item.getKind() == SimpleTptpParserOutput.TopLevelItem.Kind.Clause) {
      SimpleTptpParserOutput.AnnotatedClause AC = ((SimpleTptpParserOutput.AnnotatedClause)item);
      ArrayList variables = new ArrayList();
      variables = TPTPParser.identifyClauseVariables(AC.getClause(), variables);
      res += "fof(";
      res += TPTPParser.getName(item) + ",";
      //      res += (conjecture) ? AC.getRole().toString() : "axiom";
      res += AC.getRole().toString();
      res += ", (" + "\n";
      if (!variables.isEmpty()) {
        res += "    " + UniversalQuantifier + " [";
        res += variables.get(0);
        for (int i = 1; i < variables.size(); i++) {
          res += "," + variables.get(i);
        }
        res += "] : " + "\n";
      }
      res += (!variables.isEmpty()) ? "      ( " : "    ";
      res += (!variables.isEmpty()) ? AC.getClause().toString(8) : AC.getClause().toString(4); 
      res += (!variables.isEmpty()) ? " )" : "";
      res += " )).";
    } 
    return res;
  }

    public String getRole () {
	if (item.getKind() == SimpleTptpParserOutput.TopLevelItem.Kind.Formula) {
	    return ((SimpleTptpParserOutput.AnnotatedFormula)item).getRole().toString();
	} else if (item.getKind() == SimpleTptpParserOutput.TopLevelItem.Kind.Clause) {
	    return ((SimpleTptpParserOutput.AnnotatedClause)item).getRole().toString();
	}
	return "plain";
    }
      

}