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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>What is the “When this XPath expression is true” parameter of an action definition evaluated relative to? The docs just say “<span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black;background:white'>an XPath expression that applies to elements and attributes;” but they don’t say what the current element is at the time the xpath is evaluated.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black;background:white'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black;background:white'>My reason for asking is this: I want to create a button to add an element to a document. But since this element is only allowed once inside its parent element, I would like the button to either disappear or be disabled if the parent element already contains the element that the button inserts.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black;background:white'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black;background:white'>Ideally, I would like to do this using the stylesheet to remove the button when the child element already exists, but CSS does not provide a selector for an element that contains (or does not contain) another element, so there does not seem to be a way to do that. (Enhancement request for an Oxygen CSS extension for this purpose)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black;background:white'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black;background:white'>So since that does not work, my next approach is to invalidate the button if the child element already exists. To do this, I think I would need the “</span>When this XPath expression is true” parameter to be evaluated relative to the path specified in the “insertLocation” parameter, but that does not seem to be how it works.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>So, what is the current element when “When this XPath expression is true” parameter is evaluated.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>And, more generally, can anyone think of a way to do what I am trying to do here?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Mark<o:p></o:p></p></div></body></html>