I have a SVG file, which is an XML document:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg
xmlns:svg="http://www.w3.org/2000/svg"
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape">
<defs
id="defs2">
<!-- a lot of stuff --> </defs>
<!-- more stuff like -->
<metadata
id="metadata5">
<rdf:RDF>
<cc:Work
rdf:about="">
<dc:format>image/svg+xml</dc:format>
<dc:type
rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
<dc:title />
</cc:Work>
</rdf:RDF>
</metadata>
<!-- etc... -->
</svg>
I want to add the svg: prefix to all the tags corresponding to the default namespace in order to get next output:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg:svg
xmlns:svg="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape">
<svg:defs
id="defs2">
<!-- a lot of stuff--> </svg:defs>
<!-- more stuff like -->
<svg:metadata
id="metadata5">
<rdf:RDF>
<cc:Work
rdf:about="">
<dc:format>image/svg+xml</dc:format>
<dc:type
rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
<dc:title />
</cc:Work>
</rdf:RDF>
</svg:metadata>
<!-- etc... -->
</svg:svg>
I am sure this is possible in one or few command lines from the shell using xmllint and/or xmlstarlet but I can't manage it.
Are you prepared to give the new Gizmo tool in Saxon 10.0 a try? If so:
Invoke Gizmo with a command like:
java -cp saxon-he-10.0.jar:jline-2.9.jar net.sf.saxon.Gizmo
Then enter the sub-commands
load x/y/z/input.xml
namespace svg http://www.w3.org/2000/svg
rename /*:svg as "svg:svg"
save x/y/z/output.xml
quit
Documentation is at http://www.saxonica.com/documentation/index.html#!gizmo
Be aware that this is very new software (only released for the first time on Monday) so you're on the bleeding edge...