code: private void parseAndExpr() throws TTXPathException {
  
          parseComparisionExpr();
  
          while (is("and", true)) {
  
              mPipeBuilder.addExpressionSingle();
  
              parseComparisionExpr();
              mPipeBuilder.addAndExpression(getTransaction());
  
          }
      }
docs: Parses the the rule AndExpr according to the following production rule:
  <p>
  [9] AndExpr ::= ComparisonExpr ( "and" ComparisonExpr )* .
  </p>
  
  @throws TTXPathException