hello, i need to use if then else in tMap component and what i know is only if else condition. how to use if then else in talend?

and how to separate string if it goes like this (abcd, efgh, ijkl, mnop) then i want to separate it for different element but in the same loop (btw, i use it for tAdvanceXMLOutput later)

from this form:

<root>
<book> abcd, efgh, ijkl, mnop</book>
</root>

so it will goes like this:

<root>
<book number = "1">abcd</book>
<book number = "2">efgh</book>
<book number = "3">ijkl</book>
<book number = "4">mnop</book>
</root>

thank you