File: //usr/share/inkscape/extensions/dpi96to90.inx
<?xml version="1.0" encoding="UTF-8"?>
<inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">
<_name>DPI 96 to 90</_name>
<id>org.inkscape.dpi96to90</id>
<dependency type="executable" location="extensions">dpiswitcher.py</dependency>
<dependency type="executable" location="extensions">inkex.py</dependency>
<param name="action" type="notebook" gui-hidden="true">
<page name="dpi_swicher" >
<param name="switcher" type="enum" gui-hidden="true">
<item value="1">DPI Switch from 96 to 90</item>
</param>
</page>
</param>
<effect needs-live-preview="false">
<object-type>all</object-type>
<effects-menu>
<submenu _name="Document"/>
</effects-menu>
</effect>
<script>
<command reldir="extensions" interpreter="python">dpiswitcher.py</command>
</script>
</inkscape-extension>