more elegant solution to modify the svgs which keeps the svgs editable

2014/artwork/pause.svg

@@ -148,14 +148,14 @@
        id="g_background"
        transform="translate(3.2142857,-29.821429)">
       <image
-         xlink:href="file:///%workdir/foto-soft.jpg"
+         xlink:href="foto-soft.jpg"
          y="313.82144"
          x="-3.2142856"
          id="image_background"
          height="768"
          width="1024" />
       <image
-         xlink:href="file:///%workdir/logo_ohne_rand-332.png"
+         xlink:href="logo_ohne_rand-332.png"
          y="537.82141"
          x="28.785715"
          id="image_logo"
@@ -174,8 +174,8 @@
          id="rect_banderole_1" />
     </g>
     <g
-       style="opacity:%opacity1"
-       id="g3849">
+       style="opacity:1"
+       id="text1">
       <text
          sodipodi:linespacing="80.000001%"
          id="text2992"
@@ -218,8 +218,8 @@
 
     </g>
     <g
-       style="opacity:%opacity2"
-       id="g3849">
+       style="opacity:0"
+       id="text2">
       <text
          sodipodi:linespacing="80.000001%"
          id="text2992-5"