On 04/09/07, Florent Georges <[EMAIL PROTECTED]> wrote: > sebb wrote: > > Hi > > > The expression is entered by the user, which is why it is > > a pain to use the work-round. > > Ok, I misunderstood you. In this case, you should ask the user, > besides the XPath expression, to bound namespace prefixes he/she used > within this expression. > > You should never rely on prefixes outside the context of prefix > binding. XPath is very convenient and powerful, but relies on the > hosting language for some stuff, as the namespace bindings. Within > XSLT or any other XML hosting language, it is very intuitive; within a > GUI it has to be more explicitely thought about. > > For instance, with the following document: > > > > <pr:elem1 xmlns:pr="uri 1"> > > > <pr:elem2 xmlns:pr="uri 2"/> > > > </pr:elem1> > > the user could say (plain emails are not the easiest way to draw GUI's > windows, but you should see the overall principle): > > bindings: > u1=uri 1 > u2=uri 2 > > expression: > /u1:elem1/u2:elem2 > > to get the deepest element.
OK, I now understand that XPath requires that the namespace must be (unambiguously) pre-defined; this is not possible when the namespace is declared on a child element. > See the following page to find a way to set on the Java object > standing for the XPath expression the bindings that the user set on the > GUI: > > http://xml.apache.org/xalan-j/xpath_apis.html#namespacecontext I've had a look at that, but it is a bad example: it is actually not necessary to do any binding in that case. This can be seen by using the ApplyXPathDOM or ApplyXPath command-line tests - they work fine. Presumably this is because the namespaces are declared at the top level, allowing xalan to use the declarations for the whole document. Also, there has to be a nicer way to declare namespaces - the example suggests that it is necessary to create ones own (hard-coded) classes. Surely there is a utility class to do this? > Regards, > > --drkm > > > > > > > > > > > > > > > > > > > > > ______________________________________________________________________________ > Stockage illimité de vos mails avec Yahoo! Mail. Changez aujourd'hui de mail ! > >
