Parse XSD file to get element names from complex type

Question

I am trying to get the element names in an XSD file. Let's say I have this xsd:

For SomethingOne, I want to print out all the element names (e.g. Id, Time, Location, etc...). Here's the Java code I have:

public void parse(String id) {
    try {
        // Setup classes to parse XSD file for complex types
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        Document doc = db.parse(new FileInputStream("filepath.xsd"));

        // Given the id, go to correct place in XSD to get all the parameters
        XPath xpath = XPathFactory.newInstance().newXPath();
        NodeList result = (NodeList) xpath.compile(getExpression(id)).evaluate(doc, XPathConstants.NODESET);

        for(int i = 0; i < result.getLength(); i++) 
        {
            Element e = (Element) result.item(i);
            System.out.println(e.getAttribute("name") + " = " + e.getNodeValue());
        }

    } catch(Exception e) {
        e.printStackTrace();
    }
}

// Get XSD Expression
private String getExpression(String id) {
    String expression = "";

    switch(id)
    {
    case "99":
        expression = "//xsd:complexType[@name='SomethingOne']//xsd:element";
        break;

    default:
        System.out.println("
 Invalid id");
        break;
    }

    return expression;
}

The problem I'm having is the for loop. result.getLength() returns 0. I cannot figure out why. Any help would be appreciated, thank you!

norim_13 · Accepted Answer

Is your xsd valid? I tested the expression online and it worked, but only with a small workarounds in your xsd.

I just put the code inside a xsd:schema tag:

The xpath query seems to be ok with these changes. Tested here: http://www.freeformatter.com/xpath-tester.html

UPDATE:

Remove "xsd:" in the xpath query:

//complexType[@name='SomethingOne']//element

I tested it in a Java project and returned 5 results.

Parse XSD file to get element names from complex type

Answers (1)

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