Re: How do I access the original name for XML elements, including the original namespace prefix.

Wednesday, October 22, 2008, 1:02:37 PM, Jonathan Revusky wrote:

> If you simply parse the document using a parser that is not
> namespace-aware, then you'll have the element names with the prefixes.
>
> Otherwise, I guess you need some way of exposing the namespace->prefix
> reverse lookup table to your template.
>
> That actually should not be too difficult. You just need to expose a
> method to the template that wraps the element.getPrefix() method from
> the DOM API. Of course, element.prefix can't work, since there is no
> way of knowing for sure that there isn't one or more child elements
> named 'prefix'

But element.@@prefix is the way we do these things (only @@prefix is
not supported yet). Also it would be a bit confusing, as we prefer to
use the prefixes assigned by <#ftl ns_prefixes=...> for obvious
reasons, so it should be @@original_prefix. Still, the xmlns:...
attributes had to be accessible as well, also CDATA vs PCDATA, etc.,
if someone wants to use this for XML source preproduction.

> JR
>
> On Wed, Oct 22, 2008 at 12:49 PM, Geoff Shuetrim <[email protected]> wrote:
>> Daniel
>>
>> Thanks for the quick response.  Just to be absolutely clear, I am
>> generating an XML DOM object using a namespace-aware document builder
>> factory.  That produces XML DOM objects where I can call the getPrefix()
>> method (see http://tinyurl.com/56onqp) for element nodes and get back
>> the namespace prefix used for that node.  Thus, the original prefixes
>> are exposed by my original data structure.  However, when I access those
>> same element nodes in the XML DOM from within a freemarker template and
>> then use the getPrefix() method (eg: element.prefix) I run into a
>> situation where I get back an empty freemarker.ext.dom.NodeListModel.
>>
>> Is there something about the way that the element nodes are being
>> wrapped that hides the prefixes from me?
>>
>> Cheers
>>
>> Geoff Shuetrim
>>
>>
>>
>>
>> On Wed, 2008-10-22 at 08:29 +0200, Daniel Dekany wrote:
>>> Tuesday, October 21, 2008, 7:58:56 AM, Geoff Shuetrim wrote:
>>>
>>> > I am trying to use Freemarker to produce an HTML representation of an
>>> > XML document, maintaining all of the information in the original
>>> > document (including xmlns:prefix="namespaceURI" declarations and the
>>> > prefixes on element names).
>>> >
>>> > Note that I do not know, in advance, what the namespaces used in the XML
>>> > document will be, so I cannot declare them in my Freemarker template.
>>> >
>>> > When using the XML processing capabilities of Freemarker to access
>>> > elements in the XML document, is there some way for me to access the
>>> > original node name including the original prefix?
>>>
>>> It's not possible (as the prefix name in the XML source is irrelevant
>>> according to the XML info-model), unless you set the XML parser to
>>> namespace unaware, with
>>> DocumentBuilderFactory.setNamespaceAware(boolean).
>>>
>>> > Regards
>>> >
>>> > Geoff Shuetrim
>>> >
>>> > As background, I am currently generating the HTML rendering of the XML
>>> > using the following macros:
>>> >
>>> > [#escape x as x?html]
>>> > [@displayChildren parent=someElementNode indent=0 /]
>>> > [/#escape]
>>> >
>>> >
>>> > [#macro displayChildren parent indent]
>>> >
>>> > [#if parent?node_type="text"]
>>> > [#if parent?trim!=""]
>>> > <br/>
>>> > [@space indent=indent/]
>>> > [@elementText text="${parent?html}"/]
>>> > [/#if]
>>> > [/#if]
>>> >
>>> > [#if parent?node_type="element"]
>>> >
>>> [#if indent >> 0]<br/>[/#if]
>>> > [@space indent=indent/]
>>> > [@leftBracket/]
>>> > [@elementName text="${parent?node_name}"/]
>>> >
>>> > [#assign children = parent?children /]
>>> > [#assign hasChildren = (children?size != 0) /]
>>> > [#assign attributes = parent.@@ /]
>>> > [#assign hasAttributes = (attributes?size != 0) /]
>>> > [#assign isLeafNode = (children?size = 0) /]
>>> >
>>> > [#if hasAttributes]
>>> > [#list attributes as attribute]
>>> > [#assign markup = attribute.@@markup?html /]
>>> > [#assign parts = markup?split("=") /]
>>> > [#assign name = parts[0] /]
>>> > [#assign value = parts[1] /]
>>> > <br/>[@space indent=(indent+1)/]
>>> > [@attributeName text="${name}"/]
>>> > =
>>> > [@attributeValue text="${value}"/]
>>> > [/#list]
>>> > [/#if]
>>> >
>>> > [#if isLeafNode]
>>> > [@closeRightBracket /]
>>> > [#else]
>>> > [@rightBracket /]
>>> > [#list children as child]
>>> > [@displayChildren parent=child indent=(indent+1) /]
>>> > [/#list]
>>> > <br/>
>>> > [@space indent=indent /]
>>> > [@leftBracket /]
>>> > /
>>> > [@elementName text="${parent?node_name}" /]
>>> > [@rightBracket /]
>>> > [/#if]
>>> >
>>> > [/#if]
>>> >
>>> > [/#macro]
>>> >
>>> > [#macro space indent]
>>> > [#if indent!=0]
>>> > [#list 1..indent as tab]
>>> > &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
>>> > [/#list]
>>> > [/#if]
>>> > [/#macro]
>>> >
>>> > [#macro leftBracket symbol="&lt;"]
>>> > <span class="element">${symbol}</span>
>>> > [/#macro]
>>> >
>>> > [#macro rightBracket symbol="&gt;"]
>>> > <span class="element">${symbol}</span>
>>> > [/#macro]
>>> >
>>> > [#macro closeRightBracket symbol="&gt;"]
>>> > <span class="element">/${symbol}</span>
>>> > [/#macro]
>>> >
>>> > [#macro elementName text]
>>> > <span class="elementName">
>>> > ${text?html}
>>> > </span>
>>> > [/#macro]
>>> >
>>> > [#macro elementText text]
>>> > <span class="elementText">${text}</span>
>>> > [/#macro]
>>> >
>>> > [#macro attributeName text]
>>> > <span class="attributeName">${text}</span>
>>> > [/#macro]
>>> >
>>> > [#macro attributeValue text]
>>> > <span class="attributeValue">${text}</span>
>>> > [/#macro]

-- 
Best regards,
 Daniel Dekany


-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/