How to make string from xml structure?

[Fisher2003]

is there any way how to make from:\[code\] <content> <headline>Big headline</headline> <headline>Small headline</headline> </content>\[/code\]string in XML structure? Something like:\[code\]<xml><root> <pageContent> "<content><headline>Big headline</headline><headline>Small headline</headline</content>" </pageContent></root>\[/code\]where all in "" is something like string. I mean string for parsers. Thx for reply.