change value inside qoutes in xml file from bash

I'm writing a bash script to streamline an installation.

I want to replace the old database settings in an xml file with a new value. But I don't manage to get it right

original string: url="jdbc:oracle:thin:@localhost:1521:xe"

script:

read -e -p "Enter the ORACLE SID: " -i "orcl" ORACLE_SID_VALUE
sed -i  '/url="jdbc:oracle:thin:@localhost:1521:xe"/c\url="jdbc:oracle:thin:@localhost:1521:$ORACLE_SID_VALUE"' /home/server/tomcat/conf/Catalina/localhost/server.xml

result in xml file: url="jdbc:oracle:thin:@localhost:1521:$ORACLE_SID_VALUE"

Can anyone help me?