/// <summary>
/// Convert the expression into a <c>ConstantTerm</c>.
/// </summary>
/// <param name="constant">A constant expression.</param>
/// <returns>A <c>ConstantTerm</c> object.</returns>
public static ISparqlExpression AsSparqlExpression(this ConstantExpression constant)
{
return(new ConstantTerm(constant.AsNode()));
}
