$key :
$size :
$values :
$skipedValues :
$parent :
__toString()
valid()
current()
key()
prev()
next( $offset = 1)
rewind()
end()
append(self $value)
count()
skipValue( $value)
getSkipedValues()
reset()
getValue()
seek( $key)
findTag( $tag)
goToNextTagWhichIsNot(array $tags)
setParent(self $parent)
getParent()
getRoot()