I want to address that reuse/repetition thing. It's totally possible to do this in XML+XSLT. E.g. you have some repeating structure that totally calls for what

I want to address that reuse/repetition thing. It's totally possible to do this in XML+XSLT. E.g. you have some repeating structure that totally calls for what would be a helper function in a conventional language, say, "createMyButton(this, that)". In XML that could be done like this: <android:whatever xmlns:ext="urn:my-corp/ui-ext"> <ext:my-button this="..." that="..." /> </android:whatever> This gets fed into an XSLT file that copies everything intact and expands your custom elements: <xsl:template match="ext:my-button"> <!-- expand into what you need --> </xsl:template>