Moved management of ObjectModel to cocoon: protocol if it's used. This fixes various errors with disappearing values from OM when cocoon: protocol is used. The side-effect of this hack is that values could be visible outside their scope in some rare cases. I haven't found any good way to avoid it due to complicated flow in SitemapSource.
cocoon/branches/cocoon-2.2/cocoon-sitemap-components/cocoon-sitemap-components-1.0.0-RC2/src/main/java/org/apache/cocoon/components/source/impl/SitemapSource.java