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I am parsing an xml file generated by an external program . I would then like to add custom annotations to this file, using my own namespace. My input looks as below: <sbml xmlns="http://www.sbml.org/sbml/level2/version4" xmlns:celldesigner="http://www.sbml.org/2001/ns/celldesigner" level="2" version="4"> <model metaid="untitled" id="untitled"> <annotation>...</annotation> <listOfUnitDefinitions>...</listOfUnitDefinitions> <listOfCompartments>...</listOfCompartments> <listOfSpecies> <species metaid="s1" id="s1" name="GenA" compartment="default" initialAmount="0"> <annotation> <celldesigner:extension>...</celldesigner:extension> </annotation> </species> <species metaid="s2" id="s2" name="s2" compartment="default" initialAmount="0"> <annotation> <celldesigner:extension>...</celldesigner:extension> </annotation> </species> </listOfSpecies> <listOfReactions>...</listOfReactions> </model> </sbml> The issue being that lxml only declares namespaces when they are used, which means the declaration is repeated many times, like so (simplified): <sbml xmlns="namespace" xmlns:celldesigner="morenamespace" level="2" version="4"> <listOfSpecies> <species> <kjw:test xmlns:kjw="http://this.is.some/custom_namespace"/> <celldesigner:data>Some important data which must be kept</celldesigner:data> </species> <species> <kjw:test xmlns:kjw="http://this.is.some/custom_namespace"/> </species> .... </listOfSpecies> </sbml> Is it possible to force lxml to write this declaration only once in a parent el

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