http://xmlgraphics.apache.org/fop/: Apache FOP (Formatting Objects Processor) is the world's first print formatter driven by XSL formatting objects (XSL-FO) and the world's first output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, AFP, TIFF, PNG, SVG, XML (area tree representation), Print, AWT and TXT. The primary output target is PDF. (Apache Software Foundation) 
public interface org.apache.fop.fo.expr.Function
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.apache.fop.fo.expr.Function
  super_class: java.lang.Object
{
  public abstract int getRequiredArgsCount();
    descriptor: ()I
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract int getOptionalArgsCount();
    descriptor: ()I
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract org.apache.fop.fo.properties.Property getOptionalArgDefault(int, org.apache.fop.fo.expr.PropertyInfo);
    descriptor: (ILorg/apache/fop/fo/expr/PropertyInfo;)Lorg/apache/fop/fo/properties/Property;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws org.apache.fop.fo.expr.PropertyException
    MethodParameters:
       Name  Flags
      index  
      pi     

  public abstract boolean hasVariableArgs();
    descriptor: ()Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract org.apache.fop.datatypes.PercentBase getPercentBase();
    descriptor: ()Lorg/apache/fop/datatypes/PercentBase;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract org.apache.fop.fo.properties.Property eval(org.apache.fop.fo.properties.Property[], org.apache.fop.fo.expr.PropertyInfo);
    descriptor: ([Lorg/apache/fop/fo/properties/Property;Lorg/apache/fop/fo/expr/PropertyInfo;)Lorg/apache/fop/fo/properties/Property;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws org.apache.fop.fo.expr.PropertyException
    MethodParameters:
      Name  Flags
      args  
      pi    
}
SourceFile: "Function.java"