serialization options ] [options] [file]
|-r,relative||Add base URI's expressed as relative URI's relative to their parent|
|-a,-all||Add base URI's to ALL nodes otherwise only adds a base URI to the root element, |
and any child element who's base URI differes from its parent.
If not specified all xml:base attributes are removed which are unnecessary (who's value equals that of their parent).
Supports the standard [ serialization options ]
$ xaddbase -r file.xml