Reference one string from another string in strings.xml?

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A nice way to insert a frequently used string (e.g. app name) in xml without using Java code:
source

    <?xml version="1.0" encoding="utf-8"?>
    <!DOCTYPE resources [
      <!ENTITY appname "MyAppName">
      <!ENTITY author "MrGreen">
    ]>

<resources>
    <string name="app_name">&appname;</string>
    <string name="description">The &appname; app was created by &author;</string>
</resources>

UPDATE:

You can even define your entity globaly e.g:

res/raw/entities.ent:

<!ENTITY appname "MyAppName">
<!ENTITY author "MrGreen">

res/values/string.xml:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE resources [
    <!ENTITY % ents SYSTEM "./res/raw/entities.ent">
    %ents;   
]>

<resources>
    <string name="app_name">&appname;</string>
    <string name="description">The &appname; app was created by &author;</string>
</resources>

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