Problem with notes

I'm trying to create a DocBook 5 RNG
file that has a note element as its root. However, I keep getting the following
error in oXygen:

E[oNVDL] element "note"
from namespace "http://docbook.org/ns/docbook" not allowed in
this context.

Any ideas about what I'm doing wrong?

Thank you,

Kate

The following is the xml that I'm using:

<note xmlns="http://docbook.org/ns/docbook"
version="5.0">

 <title>Separately licensed
component required</title>

 <para>ECC encryption
and FIPS-certified encryption require a separate license. All strong encryption
technologies are subject to export regulations.</para>

 <para>See <olink targetdoc="firstguide"
targetptr="aboutasa-s-3623168">Separately licensed components</olink>.</para>

</note>