xpath assertion in soapui not working - xpath

Question

I am reach up to this using xpath- //ns1:GetAtomicWeightResponse/ns1:GetAtomicWeightResult[1] but how to reach upto AtomicWeight.
<NewDataSet>
<Table>
<AtomicWeight>12.0115</AtomicWeight>
</Table>
</NewDataSet>
Here , I am not able to get value of AutomicWeight from table XML.
EDIT: Based on the comments from OP, adding the xml in the question.
<soap:Envelope
xmlns:soap="schemas.xmlsoap.org/soap/envelope/"
xmlns:xsi="w3.org/2001/XMLSchema-instance"
xmlns:xsd="w3.org/2001/XMLSchema">
<soap:Body>
<GetAtomicWeightResponse
xmlns="webserviceX.NET">
<GetAtomicWeightResult>
<![CDATA[<NewDataSet><Table><AtomicWeight>12.0115</AtomicWeight></Table></NewDataSet>]]>
</GetAtomicWeightResult>
</GetAtomicWeightResponse>
</soap:Body>
</soap:Envelope>

Answer 1

Consider Following response in your soap XML
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<soap:Body>
<ConversionRateResponse xmlns="http://www.webserviceX.NET/">
<ConversionRateResult>1505.7</ConversionRateResult>
</ConversionRateResponse>
</soap:Body>
</soap:Envelope>
Xpath would be
declare namespace ns1='http://www.webserviceX.NET/';
//ns1:ConversionRateResponse[1]/ns1:ConversionRateResult[1]

Answer 2

Please use below xpath
//NewDataSet/Table/AtomicWeight
EDIT: Based on OP's data
Since, the data originally mentioned by you is in cdata that is why you were not able to get that value.
You can use below Groovy Script:
def xml = """<soap:Envelope xmlns:soap="schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="w3.org/2001/XMLSchema-instance" xmlns:xsd="w3.org/2001/XMLSchema">
<soap:Body>
<GetAtomicWeightResponse xmlns="webserviceX.NET">
<GetAtomicWeightResult><![CDATA[<NewDataSet><Table><AtomicWeight>12.0115</AtomicWeight></Table></NewDataSet>]]></GetAtomicWeightResult>
</GetAtomicWeightResponse>
</soap:Body>
</soap:Envelope>"""
def getData = { data, element -> new XmlSlurper().parseText(data).'**'.find{it.name() == element} }
def atomicWeight = getData((getData(xml, 'GetAtomicWeightResult') as String).trim(), 'AtomicWeight').text()
log.info atomicWeight
Or you can quickly try online Demo
If you are using it in SoapUI's test case, you do not have to add an additional Groovy Test step to get that value. Instead add the Script Assertion to the same request step (where you get that response) with below code(processing is same, but you do not have to use fixed xml, instead a dynamic response can be used).
Script Assertion
assert context.response, 'Response is empty or null'
def getData = { data, element -> new XmlSlurper().parseText(data).'**'.find{it.name() == element} }
def atomicWeight = getData((getData(context.response, 'GetAtomicWeightResult') as String).trim(), 'AtomicWeight').text()
log.info atomicWeight