if (childCollections == null) readCollection();
readCollection();
	public String[] listChildCollections() throws XMLDBException {		if (childCollections == null)			readCollection();		String coll[] = new String[childCollections.size()];		int j = 0;		XmldbURI uri;		for (Iterator i = childCollections.keySet().iterator(); i.hasNext(); j++) {			uri = (XmldbURI) i.next();			coll[j] = uri.lastSegment().toString();		}		return coll;	}