Add element and attribute tag to allow optimized head element addition

How about allowing element/attribute tag like the following example?

<hst:head-contribution keyHint="test">
<hst:element name="script">
<hst:attribute name="language">javascript</hst:attribute>
<hst:attribute name="src">http://dns/scripts/library.js</hst:attribute>
</hst:element>
</hst:head-contribution>

With usage like the above, it can be more optimized because text does not need to parsed.