bash - Adding XML element in XML file using sed command in shell script -

i using sed command insert xml element existing xml file.

i have xml file

<students>     <student>         <name>john</>         <id>123</id>     </student>     <student>         <name>mike</name>         <id>234</id>     </student> </students> 

i want add new elememt

    <student>         <name>newname</name>         <id>newid</id>     </student> 

so new xml file be

<students>     <student>         <name>john</>         <id>123</id>     </student>     <student>         <name>mike</name>         <id>234</id>     </student>     <student>         <name>newname</name>         <id>newid</id>     </student> </students> 

for have written shell script

#! /bin/bash  content="<student>             <name>newname</name>             <id>newid</id>         </student>"  #sed -i.bak '/<\/students>/ \ "$content" /root/1.xml sed -i.bak '/<\/students>/ \'$content'/' /root/1.xml 

i getting error as

sed: can't read <name>newname</name>: no such file or directory sed: can't read <id>newid</id>: no such file or directory sed: can't read </student>: no such file or directory 

and in xml file, <student> added. remaining elements not added. know why error?

change :

content="<student>             <name>newname</name>             <id>newid</id>         </student>" 

to :

content="<student>\n<name>newname</name>\n<id>newid</id>\n</student>" 

and :

c=$(echo $content | sed 's/\//\\\//g') sed "/<\/students>/ s/.*/${c}\n&/" file