Shell Programming and Scripting

Hello,
I have two xml files. One master and the other temp. Each xml files are in format given below.

Sample input file lines:

Code:

ABC=5673;DEF=GHYU
Date
<input>
<class>
<blah blah>
<blah blah>
</class>
</input>


ABC=1683;DEF=DFYU
Date
<input>
<class>
<blah blah>
<blah blah>
</class>
</input>


ABC=5081;DEF=GQKI
Date
<input>
<class>
<blah blah>
<blah blah>
</class>
</input>

All lines between <input> and </input> is one order and the first line e.g. ABC=5081;DEF=GQKI is the information associated with the order below it.

I need to find all orders in temp that are not in master xml and append all of them at the top of master xml.
Note: The first line of all orders i.e. ABC=5081;DEF=GQKI in master xml should be unique, so the comparison could be done on this line.

Any help is highly appreciated..

---------- Post updated at 09:17 AM ---------- Previous update was at 09:13 AM ----------

I am sorry I forgot to mention.
I am working on Solaris.

Code:

awk -v RS="" -v FS="\n" 'NR==FNR{a[$1]=$0;next} !a[$1] {print $0 ORS ORS}
    END{system ("cat master.xml")}' master.xml temp.xml