If we assume that each line between the {} container is an XML document then What I want to remove the newline character from all lines within each container to have one XMDL document per line I wrote a bit of sed after trawling the web:

e.g.

#!/bin/sed -nf

H
/}/ {
x
s/\n//g
p
}

This process is not quite behaving how I expect in that some of the lines are mixed up between the containers

File before being passed to sed

{dwfglsdfsdfsdfsdfsdfsdfsdfsdfsdf\n
dgdgdgdgdgdgdgdgdgdgdg\n
dfgsdfgsdfgsdfg}\n
\n
{sdgfsdgggggggggggggggg\n
ggggggggggggggggggggg\n
gggggggggggggggggggggsdf\n
d}\n
\n
{asdfasdfasdfasd\n
asdfasdfasdfasdf\n
sfasdfasdfasdf\n
sdfasdfasdfasdf}\n
\n

File after sed (is what I am hoping for with the only \n after the end }):

{dwfglsdfsdfsdfsdfsdfsdfsdfsdfsdfsdfsdfsdfsdfdgdgdgdfgsdfgsdfgsdfg}\n
{sdgfsdgggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggsdfd}\n
{asdfasdfasdfasdasdfasdfasdfasdfsfasdfasdfasdfsdfasdfasdfasdf}\n

what I am getting is:

{dwfglsdfsdfsdfsdfsdfsdfsdfsdfsdfsdfsdfsdfsdfdgdgdgdgdgdgdgdgdgdgdg
dfgsdfgsdfgsdfg}\n
{sdgfsdgggggggggggggggggggggggggggggggggggggggggggggggggsdfd}{asdfasdfasdfasdasdfasdfasdfasdfsfasdfa sdfasdfsdfasdfasdfasdf}\n

The lines are long so I would expect wrapping per one line but not to see a container }{ being embedded within a line without a newline after the enclosing }