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Hi, is there anyway of placing a key constraint on an optional attribute? namely, if the optional attribute is defined for the element then it must be unique compared to the other, optionally, defined attributes (same attribute). ive tried xpath expressions such as ".//elementName[@OptAttr]" for the selector, but i get an error along the lines of "invalid XPATH for selector or field" thanks in advance paul ********************************************************************** This email is confidential. If you are not the intended recipient, you must not copy, distribute, disclose or otherwise use the information contained in it. If you have received this email in error, please tell us immediately by return email or by contacting us on (+61 8) 9209 6900 and delete the document. Email may be susceptible to data corruption, interception and unauthorised amendment. Advanced Engine Components Ltd is not responsible for any changes made to a document other than those made by Advanced Engine Components Ltd, or for the effect of the changes on the document's meaning. You must scan this email and any attachments for viruses. Advanced Engine Components Ltd accepts no liability for any loss, damage or consequence, whether caused by our own negligence or not, resulting directly or indirectly from your receipt of this email or the use of any attachments. **********************************************************************
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