code: function hasAttribute($attr, $compare = 'total', $case_sensitive = false) {
  		return ((bool) $this->findAttribute($attr, $compare, $case_sensitive));
  	}
docs: Checks if node has attribute
  @param string|int$attr Negative int to count from end
  @param string $compare Find node using "namespace", "name" or "total"
  @param bool $case_sensitive Compare with case sensitivity
  @return bool