sed: replace string with another string (with spaces)

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# 1  
Old 07-13-2009
sed: replace string with another string (with spaces)

I have an XML file with strings XABCD, XEFGHX and XIJKLX. I would like to replace XABCDX with "This is the first string", XEFGHX with "This is the second string" and XIJKLX with "This is the third string".

What is the best way to implement this? Should I have a file with the data that is read by a script which uses sed commands or can this be within the script itself? Assuming that I have x number of strings like the above. an example will be helpful. Thx.
# 2  
Old 07-13-2009
sed -e 's/XABCD/This is the first string/g' -e 's/XEFGHX/This is the second string/g' -e 's/XIJKLX//This is the third string/g' XMLFILE > XMLFILE.$$ && \

would do the trick but would get cumbersome if you had say 99 different strings you wanted to substitute, I'm sure a scripting guru my come up with something more elegant!
# 3  
Old 07-14-2009
Thx Tony. Any other suggestions on this? Thx.
# 4  
Old 07-15-2009
Any suggestions on this? Thx.
# 5  
Old 07-16-2009
awk -v FS='|' ' NR == FNR { arr[$1]=$2; next }
    for (str in arr)
    print $0
}' data_file input_file

data_file has the format
string1|replacement for string1

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