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Home » Modeling » EMF » CDATA appearing in xsd:any data
CDATA appearing in xsd:any data [message #1385978] Thu, 12 June 2014 15:09 Go to next message
Rob Mising name is currently offline Rob Mising nameFriend
Messages: 118
Registered: July 2010
Senior Member
Hi Ed,

I have stumbled accross something a little strange that I would really appreciate your input on.

I have a schema as follows:

<xs:element name="person">
	<xs:complexType>
		<xs:sequence>
			<xs:element name="firstname" type="xs:string"/>
			<xs:element name="lastname" type="xs:string"/>
			<xs:any processContents="lax" minOccurs="0" maxOccurs="5" ecore:name="customAny"/>
		</xs:sequence>
	</xs:complexType>
</xs:element>


Then if I do something like:

Car createCar = ElmAndComplexFactory.eINSTANCE.createCar();
createCar.setColour("red");

// Now create the Complex object with the any
personType createpersonType = SimpleAnyNamedFactory.eINSTANCE.createpersonType();
createpersonType.setFirstname("Betty");
createpersonType.setLastname("Rubble");
createpersonType.setCustomAny(createCar);

String s = serialize(createpersonType);
		
// Remove from the package reg for the value we are putting into the xsd:any
// Need to first save off the entry - we will add it later
String regKey = ElmAndComplexFactory.eINSTANCE.getEPackage().getNsURI();
OSGiEnabledPackageRegistry.INSTANCE.remove(regKey);

personType personType2 = (personType) deserialize(s);
s = serialize(personType2);
System.out.println(s);


It's a bit contrived in this example - our case is a bit more complicated, the key bit is once we have it in an XML format we then make sure the type in the "xsd:any" is no longer in the EMF Registry. The serialise/deserialise methods just do a save/load on the resource. When sysout is done it will print:

<named:person xmlns:ElmAndComplex="http://example.com/ElmAndComplex" xmlns:named="http://example.com/SimpleAnyNamed">
  <firstname>Betty</firstname>
  <lastname>Rubble</lastname>
  <ElmAndComplex:myCarElement>
    <colour>red</colour>
  </ElmAndComplex:myCarElement>
</named:person>


This is all good, but if we now set the following option to "true":

XMLResource.OPTION_ESCAPE_USING_CDATA


Then we get the following XML:

<named:person xmlns:ElmAndComplex="http://example.com/ElmAndComplex" xmlns:named="http://example.com/SimpleAnyNamed">
  <firstname>Betty</firstname>
  <lastname>Rubble</lastname>
  <ElmAndComplex:myCarElement><![CDATA[
    ]]><colour>red</colour><![CDATA[
  ]]></ElmAndComplex:myCarElement>
</named:person>


The problem is "<![CDATA[" values which appear where there is any white space in the XML - it is a bit like it is treating the xsd:any as a string, and hence escaping it.

Any thoughts you have would be appreciated.

Thanks

Rob



Re: CDATA appearing in xsd:any data [message #1386031 is a reply to message #1385978] Fri, 13 June 2014 06:46 Go to previous messageGo to next message
Ed Merks is currently offline Ed MerksFriend
Messages: 30452
Registered: July 2009
Senior Member
Comments below.

On 12/06/2014 5:09 PM, Rob Mising name wrote:
> Hi Ed,
>
> I have stumbled accross something a little strange that I would really
> appreciate your input on.
>
> I have a schema as follows:
>
> <xs:element name="person">
> <xs:complexType>
> <xs:sequence>
> <xs:element name="firstname" type="xs:string"/>
> <xs:element name="lastname" type="xs:string"/>
> <xs:any processContents="lax" minOccurs="0" maxOccurs="5"
> ecore:name="customAny"/>
> </xs:sequence>
> </xs:complexType>
> </xs:element>
>
>
> Then if I do something like:
>
> Car createCar = ElmAndComplexFactory.eINSTANCE.createCar();
> createCar.setColour("red");
>
> // Now create the Complex object with the any
> personType createpersonType =
> SimpleAnyNamedFactory.eINSTANCE.createpersonType();
> createpersonType.setFirstname("Betty");
> createpersonType.setLastname("Rubble");
> createpersonType.setCustomAny(createCar);
>
> String s = serialize(createpersonType);
>
> // Remove from the package reg for the value we are putting into the
> xsd:any
> // Need to first save off the entry - we will add it later
> String regKey = ElmAndComplexFactory.eINSTANCE.getEPackage().getNsURI();
> OSGiEnabledPackageRegistry.INSTANCE.remove(regKey);
I have no idea what this means, but it sounds bad.
>
> personType personType2 = (personType) deserialize(s);
> s = serialize(personType2);
> System.out.println(s);
>
>
> It's a bit contrived in this example - our case is a bit more
> complicated, the key bit is once we have it in an XML format we then
> make sure the type in the "xsd:any" is no longer in the EMF Registry.
I don't understand this statement or why you'd do it...
> The serialise/deserialise methods just do a save/load on the
> resource. When sysout is done it will print:
>
>
> <named:person xmlns:ElmAndComplex="http://example.com/ElmAndComplex"
> xmlns:named="http://example.com/SimpleAnyNamed">
> <firstname>Betty</firstname>
> <lastname>Rubble</lastname>
> <ElmAndComplex:myCarElement>
> <colour>red</colour>
> </ElmAndComplex:myCarElement>
> </named:person>
>
> This is all good, but if we now set the following option to "true":
>
> XMLResource.OPTION_ESCAPE_USING_CDATA
>
> Then we get the following XML:
>
> <named:person xmlns:ElmAndComplex="http://example.com/ElmAndComplex"
> xmlns:named="http://example.com/SimpleAnyNamed">
> <firstname>Betty</firstname>
> <lastname>Rubble</lastname>
> <ElmAndComplex:myCarElement><![CDATA[
> ]]><colour>red</colour><![CDATA[
> ]]></ElmAndComplex:myCarElement>
> </named:person>
>
> The problem is "<![CDATA[" values which appear where there is any
> white space in the XML - it is a bit like it is treating the xsd:any
> as a string, and hence escaping it.
So likely this comes down to having windows line feeds in your data.
But I have no idea how you built the instance...
>
> Any thoughts you have would be appreciated.
>
> Thanks
>
> Rob
>
>
>
>
Re: CDATA appearing in xsd:any data [message #1386079 is a reply to message #1386031] Fri, 13 June 2014 11:14 Go to previous message
Rob Mising name is currently offline Rob Mising nameFriend
Messages: 118
Registered: July 2010
Senior Member
OK, I have looked a little further into this, it appears that whenever data is stored into an "xsd:any" it assumes that it is "mixed xml" - this means that it always believes that it should print it exactly as the input data. When mixed isn't supported for the XML added to the xsd:any, then this isn't normally a problem as it would just be white space - which will be ignored within the generated XML.

However, when you set EMF to add CDATA to everything - then it will detect this white-space between elements - and add a CDATA around it. (Which may not be valid if the original schema for the object stored into the xsd:any did not support mixed)

I have managed to work around this by editing XMLSaveImpl in the method saveElementFeatureMap, so that in the if for "MLTypePackage.Literals.XML_TYPE_DOCUMENT_ROOT__TEXT" we now have:

if (entryFeature == XMLTypePackage.Literals.XML_TYPE_DOCUMENT_ROOT__TEXT)
{
	String svalue = value.toString();

	if (escape != null)
	{
		boolean convertTxt = true;

		// CHANGE START

		// This could be done in a single line, but it is quite hard to
		// work out the rules when viewed this way, so I have split it
		// into several lines
		if (usingCData)
		{
			if ((o instanceof AnyType) && (f instanceof EAttribute))
			{
				if (svalue.trim().length() == 0)
				{
					convertTxt = false;
				}
			}
		}
		// CHANGE END
		if( convertTxt )
		{
			svalue = escape.convertText(svalue);
		}
	}
	if (!toDOM)
	{
		doc.addText(svalue);
	}
	else
	{
		Node text = document.createTextNode(svalue);
		currentNode.appendChild(text);
		handler.recordValues(text, o, f, entry);
	}
}


The "usingCData" variable is the value read out of the passed in options to "init".
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