Extract Embedded XML within XML using XSLT

Question

Hi,
We have a unique scenario where our incoming payload is coming from Oracle Database table which has one column of CLOB type storing complete raw XML.
We need to extract this embedded raw XML and process it further, each XML has a unique XSD associated and we have that details in a separate column.
So our DBAdapter incoming payload looks like below
<rows>
<row>
<xml_xsd>xyz.xsd</xml_xsd>
<xml>RAW XML DATA</xml>
</row>
<row>
<xml_xsd>xyzv2.xsd</xml_xsd>
<xml>RAW XML DATA</xml>
</row>
<row>
<xml_xsd>xyzv2.xsd</xml_xsd>
<xml>RAW XML DATA</xml>
</row>
<row>
<xml_xsd>xyzv3.xsd</xml_xsd>
<xml>RAW XML DATA</xml>
</row>
</rows>
How can we leverage XSL Transformation to extract this embedded XML in each row? I need the each individual XML available for further mapping. I can split the payload using XPATH filtering per XSD, but not able to find a solution to parse the embedded XML and assign to a target schema?
Research done so far points to do two transformations to get resulting XML or using Saxon Parser if available and use the parse() extension.
Any other ideas/suggestions will be helpful. Challenge here is performance as i need to do this in bulk, will have many rows to process
Thanks in advance.

Answer 1

Hi,
You dont have finite set of XSD's and probably you wont be creating a variable for each type of xsd from that finite set.
Secondly, xslt doesnt support dynamic xpath as per my knowledge.
Question:
Do you really need XSD to do the validation?
A possible solution to your question would be using java approach as below: Pass the xml and the xpath query
    public String evalXpath(String xml, String xpathQuery) {
          String xpathResult ;
        DocumentBuilderFactory domFactory =
            DocumentBuilderFactory.newInstance();
        try {
            DocumentBuilder builder = domFactory.newDocumentBuilder();
            InputSource is = new InputSource(new StringReader(xml));
            Document dDoc = builder.parse(is);
            XPath xPath = XPathFactory.newInstance().newXPath();
            Object result =
                (NodeList)xPath.evaluate(xpathQuery, dDoc, XPathConstants.NODESET);
            NodeList nodes = (NodeList)result;
            for (int i = 0; i < nodes.getLength(); i++) {
                xpathResult = nodes.item(i).getNodeValue();
                System.out.println(xpathResult);
        } catch (Exception e) {
            e.printStackTrace();
        return xpathResult;
Thanks,
Rosh