XSLTForms/XQuery with eXist - How to upload files - Miscellaneous problems

Submitted by Dominique Rabeuf on Sat, 02/13/2010 - 07:59

Posted in

How to and strange problem

I discovered a trick to upload files with XSLTForms

In case of submission method "xml-urlencoded-post" XSLTForms dynamically build a form whose ID is "xsltforms_form"

If this form still exists, XSLTForms replaces the value of the first child of the form by the serialization of the submitted instance content

Example

Model

<xf:model>

<xf:instance>

<ps:data>

<ps:input> Hi everybody! </ ps: input>

</ ps: data>

</ xf: instance>

<xf:submission id="sub" method="xml-urlencoded-post" replace="all" action="load.xql">

<xf:message level="modeless" ev:event="xforms-submit-error"> Submit error. </ xf: message>

</ xf: submission>

</ xf: model>

Form

<br />

<br />

</ form>

Submission

<xf:submit submission="sub">

<xf:label class="label"> Send </ xf: label>

</ xf: submit>

This works very well, so one can say that XSLTForms supports file upload

My problem with XQuery / eXist is generating XSLTForms by XQuery

XQuery does not allow

return

<?xml version = "1.0" encoding = "iso-8859-1"?>

<?xml-stylesheet href = "some.xsl" type = "text / xsl"?>

We must, as it is documented, use a redirect pipe (controller.xml)

The problem is that the result of the transformation is strange characters are added at the beginning of IDs and inserted in some classes.

These chars are #xA and other #x160

My controller source is the following (just a copy/paste from documentation)

xquery version "1.0";

import module namespace request = "http://exist-db.org/xquery/request";

import module namespace xdb = "http://exist-db.org/xquery/xmldb";

let $ foo: = 0

return

if (ends-with ($ exist: resource "-xf.xql") or ($ exist: resource eq "xforms.xql"))

then

<view>

<set-attribute name="xslt.stylesheet" value="xsltforms/xsltforms.xsl"/>

<set-attribute name="xslt.output.omit-xml-declaration" value="yes"/>

<set-attribute name="xslt.output.indent" value="no"/>

<set-attribute name="xslt.output.media-type" value="text/html"/>

<set-attribute name="xslt.output.method" value="xhtml"/>

<set-attribute name="xslt.baseuri" value="xsltforms/"/>

</ forward>

</ view>

<cache-control cache="yes"/>

</ dispatch>

else

<cache-control cache="yes"/>

</ ignore>

I suspect that extra insertions of #x0A are due to bad interpretation of new lines patterns.

I believe that in the future controller mechanisms will be replaced by XProc

About #x0A

Remember that Microsoft, Unix, Apple have their own implementation of new line

By the way the best choice was made by Microsoft , as like for old type writers a new line must starts after a [Carriage Return] and a [Line Feed]

I am pleased to say that eXist works well under Windows Web Server 2008

Re: XSLTForms/XQuery with eXist - How to upload files - ...

Submitted by Dominique Rabeuf on Mon, 02/22/2010 - 08:24.

I suspect the (one of them ?) origin of my problem with strange XSL transformation.

It comes from the Bytes Order Mark (BOM)

Updated Post (Feb 22)

Some of my source files had BOM.

I use Visual Studio 2008 from MS that write xml and text files with BOMs.

One must in this case use notepad and resave the file in ANSI format.

reply
quote

Re: XSLTForms/XQuery with eXist - How to upload files - ...

Submitted by Kurt Cagle on Sat, 02/13/2010 - 12:15.

Dominique,

Adding the XSLTForms header is actually fairly easy in eXist:

... your xquery code

let $doc := <html xmlns:xf="http://www.w3.org/2002/xforms">...your xforms doc here ...</html>

let $xsltheader := processing-instruction xsl-stylesheet {'href="url-to-stylesheet" type="text/xsl"'}

return ($xsltheader,$doc)

This will send the xslt header in as a PI prior to the document, giving you full support for XSLTForms.

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quote

Re: XSLTForms/XQuery with eXist - How to upload files - ...

Submitted by Dominique Rabeuf on Sat, 02/13/2010 - 23:13.

I have an XML file (XForms), whose outputs returned from http (get) through IIS and Jetty are different. Rendering by Jetty led to an XSL transformation that generates extra characters (#A, #160) in the page code

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quote

Re: XSLTForms/XQuery with eXist - How to upload files - ...

Submitted by Kurt Cagle on Mon, 02/15/2010 - 09:04.

The extra characters are possibly due to text-encoding problems. In your output you can control the encodings in a transformation by using the encoding attribute:

<xsl:output method="xml" encoding="UTF-8"/>

Don't know if that helps, but it may be a start.