code: function() {
  			if (this._content !== null) {
  				return this._content;
  			}
  
  			if (!this.range || !('_contentStart' in this.range)) {
  				return '';
  			}
  
  			var r = range.create2(this.range._contentStart + 1, this.range.end - 1);
  			var source = this.source();
  			var start = r.start;
  			var out = '';
  
  			this.children.forEach(function(child) {
  				out += source.substring(start, child.range.start);
  				start = child.range.end;
  			});
  
  			out += source.substring(start, r.end);
  			return this._content = utils.trim(out);
  		}
docs: Returns current section’s actual content,
  e.g. content without nested sections
  @return {String}