[Zope] ID's in one XML Document nt unique?

hello amos, since you are the creator of XML documents, I wanted to ask you whether the node IDs in the XML document tree are not necessarily unique. I have a XML document and I try to create an index. I planned of using the node IDs from the tree as my identifiers. But I noticed that I have an ID twice. Yes, it is at a different level of the tree. Is this a bug? Is there another way to accomplish my task? regards, stephan -- Stephan Richter iXL - Software Designer and Engineer CBU - Physics, Computer Science and Chemistry Student