- * Programmatically defined {@link NamespaceContext}, code contributing
- * namespaces MUST register here with a single default prefix.
+ * Programmatically defined {@link NamespaceContext}, which is valid at runtime
+ * (when the software is running). Code contributing namespaces MUST register
+ * here with a single default prefix, and MUST make sure that stored data
+ * contains the fully qualified namespace URI.</br>
+ * </br>
+ * All environments sharing the classloader of this class MUST use strictly the
+ * same default prefix / namespace mappings, as a static reference to the
+ * mapping is kept.