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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?
 Even without schema awareness/context, surely the processor can tell when an xpath expression will result in zero match? No, it's very rarely possible. For example, consider <xsl:template match="books"> <xsl:value-of select="book[1]/authour"/> </xsl:template> Even if you have a schema telling you that the children of books can include book but the children of book can't include authour, this doesn't tell you that this path will necessarily return nothing - because there is no way you can know that every books element that the stylesheet processes will be valid against this schema. In fact it's quite common for a stylesheet to create intermediate results that (deliberately) aren't valid against the schema for the input or output document. It would however be possible to make a guess that this is wrong, and issue a warning. Incorrect warnings are always very irritating, so this is not something to be done lightly, but it's something I've wanted to attempt for a long time. Michael Kay Saxonica 
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