http://www.w3schools.com/xml/xml_namespaces.asp
Indeed inkscape defines its inkscape: prefix, at the beginning of inkscape-generated files, there is:
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<svg
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:cc="http://creativecommons.org/ns#"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns="http://www.w3.org/2000/svg"
xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
I'll setup a page on the wiki on the model of the inkscape page... *EDIT* Ah! the inkscape page doesn't exist we can do better...
*EDIT2* Done! the line to insert is:
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xmlns:freecad="http://sourceforge.net/apps/mediawiki/free-cad/index.php?title=Svg_Namespace"