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[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Avoiding boneheaded mistakes in XSLT?
 Still ignoring schema. My supposition is that *for the xml instance being processed* either the expression will or will not return a non-empty sequence. Hence there is a possible error. In this case either the first book child has an author child or not. Surely that information is available Mike? The problem is that if someone writes if (@version = "2.0") ... and there is no @version attribute, it's very likely that the semantics of the vocabulary are that an absent version attribute is to be treated as if @version="1.0". So a warning that there is no version attribute would be inappropriate here. The situation where the schema doesn't allow a version attribute is different. Michael Kay Saxonica 
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