Form Server Render Form Problem

Question

Hi,
I want to create multiple instances of a table row inside the workflow, so I wrote a script inside the form:ready event of my table row. The script adds new instances using the NumberOfRows variable which stands in my xml schema and I set it inside the workflow using setvalue qpac. After these, I am using the form server render qpac to be able to run the script and have multiple rows in the form before it reaches to any user.
There is no problem untill here. Everything goes well and I successed all. However, when I try to fill in one of the rows that I have newly created, I get a stalled action :) and many error message.
I used this expression in setvalue qpac to set newly created row :
/process_data/formvar/form-data/data/xdp/datasets/data/SATalepFormu/DetayliAciklama/UrunBi lgileri[2]/Urun
This is the error :
ERROR [com.adobe.workflow.AWS] stalling action-instance: 1099 with message: org.w3c.dom.DOMException: INVALID_CHARACTER_ERR: An invalid or illegal XML character is specified.
at org.apache.xerces.dom.CoreDocumentImpl.createElement(Unknown Source)
at com.adobe.workflow.datatype.xml.XMLDataTypeNode.newElement(XMLDataTypeNode.java:53)
at com.adobe.workflow.dom.InstanceElement.createAndAppendElement(InstanceElement.java:246)
at com.adobe.workflow.pat.service.PATExecutionContextImpl.createNodesForXPathExpression(PATE xecutionContextImpl.java:906)
at com.adobe.workflow.pat.service.PATExecutionContextImpl.setProcessDataValue(PATExecutionCo ntextImpl.java:697)
at com.adobe.workflow.pat.service.PATExecutionContextImpl.setProcessDataWithExpression(PATEx ecutionContextImpl.java:429)
at com.adobe.workflow.qpac.set_value.SetValueService.execute(SetValueService.java:72)
at com.adobe.workflow.engine.PEUtil.executeAction(PEUtil.java:184)
at com.adobe.workflow.engine.ProcessEngineBMTBean.continueBranchAtAction(ProcessEngineBMTBea n.java:2371)
at com.adobe.workflow.engine.ProcessEngineBMTBean.asyncInvokeProcessCommand(ProcessEngineBMT Bean.java:512)
It became a long message but I wait for your replies:)

Answer 1

Hi Guvenc
The SetValue QPAC does not allow you to use predicates (i.e. square brackets) on the left hand side of an assignment.
In other words:
/process_data/@myvalue = /process_data/myxml/root/repeat[3]/name
is okay, but
/process_data/myxml/root/repeat[3]/name = /process_data/@myvalue
is not okay.
There are actually some good reasons for this behaviour - Xpath is a way of retrieving data, not creating it - this is actually very unfortunate, because it would be very helpful, as you've found. (There are some interesting technical problems around using XPath to create xml, such as: what should it do if /repeat[1] and repeat[2] don't exist?)
One way to work around this is to create the entire xml document in a string or XML variable, and then assign the entire thing to the root node of your form. You may have to mess with the syntax a bit (I haven't verified that this expression is exactly correct), but it would be something like:
/process_data/formvar/form-data/data/xdp/datasets/data =
deserialize(/process_data/@xml_as_a_string)
We have a SetText QPAC which makes it a little easier to construct a large xml file as a string like this (with embedded xpath expressions), but you can also create it by using SetValue and the Xpath concatenate() function.
You can downlaod SetText from:
http://www.avoka.com/avoka/qpac_library.shtml
Depending what you're trying to do, you could also write a custom QPAC (once you have a DOM, you can do whatever you need to), or we would be happy to write one for you.
Good luck...
Howard
http://www.avoka.com