trouble with split document and markup element selection

Hello,

I have the following footer in my seperate chapter files:

<!--
    Local Variables:
    mode: sgml
    sgml-declaration: "chapter.decl"
    sgml-indent-data: t
    sgml-omittag: nil
    sgml-always-quote-attributes: t
    sgml-parent-document: ("Grass_tutorial.xml" "part" "chapter")
    End:
-->


And the following header in Grass_tutorial.xml:

<?xml version='1.0' encoding='ISO-8859-1'?>
<!DOCTYPE book PUBLIC '-//OASIS//DTD DocBook XML V4.1.2//EN'
"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"

When I load a chapter file into psgml-mode in emacs, the element selection does
not function properly. When I type 'C-c C-e TAB' I can chose from the entire
list of all existing elements in DocBook i.e. it lets me insert a 'book' element
into a 'para' element. And when I try to insert an element via the menu   
Markup->Insert Element) it tells me 'No valid element at this point'.

What am I doing wrong ? In the parent document everything works fine.

I am using Emacs 21.2.1 and psgml.el version 1.2.4 both in form of Debian packages.

Moritz


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