Philip Nye wrote:
> I am trying to build a macro around callouts and <co> elements.
>
> Given a selected <co> node, what Xpath expression can I use to calculate
> what its position (rank) is within the parent element? The result should
> be the same number that the docbook stylesheet returns for its
> counter(n) field.
>
> Have I have missed something obvious?
To my knowledge, there is no XPath function which could give you such rank.
That's why, a few months ago, I've written an extension function for one
of our customers.
Extension.java:
---
import com.xmlmind.xmledit.doc.XNode;
import com.xmlmind.xmledit.xpath.EvalException;
import com.xmlmind.xmledit.xpath.NodeIterator;
public final class Extension {
public static int indexOfNode(NodeIterator nodeSet,
NodeIterator node) {
int index = 0;
try {
XNode n = node.next();
for (;;) {
XNode nn = nodeSet.next();
if (nn == null || nn == n)
break;
++index;
}
} catch (EvalException ignored) {}
return index;
}
}
---
To use it:
[1] Copy the attached jar to one of the addon/ directories (or any
subdirectory) scanned by XXE during its startup.
[2] Declare the namespace in the file containing the macro as follows:
---
xmlns:ext="java:Extension"
---
[3] Use it in the <get> element of a <macro>. Example of use (not
related to your precise need):
---
1+ext:indexOfNode(//para, $selectedElement)
---
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