added font weight keywords

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@195025 13f79535-47bb-0310-9956-ffa450edef68

src/codegen/foproperties.xml

@@ -757,7 +757,9 @@
     <name>font-weight</name>
     <inherited>true</inherited>
     <datatype>String</datatype>
-    <default>normal</default>
+    <keyword-equiv match="normal">400</keyword-equiv>
+    <keyword-equiv match="bold">700</keyword-equiv>
+    <default>400</default>
   </property>
 
 <!-- Common Hyphenation Properties -->