Returning result of Saxon Xpath as a string

[Anonymous]

Hi!
I'm currently converting some xml manipulation code to use Saxon and got a
problem in returning the result of Saxon9 Xpath in a form of a string.

Example XML input

<Foo>
              <Bar>
                     <Baz>1</Baz>
                     <Baz>2</Baz>
              </Bar>
              <Bar>
                    <Baz>3</Baz>
                    <Baz>4</Baz>
                    <Baz>5</Baz>
                    <Baz>6</Baz>
              </Bar>
     </Foo>

Xpath used: /Foo/Bar

Below code:

    Configuration config = new Configuration();
        config.setLineNumbering(true);
        XPathEvaluator xpath = new XPathEvaluator();
        try {
            StringReader strRead = new StringReader("<Foo><Bar><Baz>1</Baz><Baz>2</Baz></Bar><Bar><Baz>3</Baz><Baz>4</Baz><Baz>5</Baz><Baz>6</Baz></Bar></Foo>");
            List results = (List) xpath.evaluate("/Foo/Bar", new StreamSource(strRead), XPathConstants.NODESET);
            for (int i=0; i<results.size(); i++) {
                net.sf.saxon.tinytree.TinyNodeImpl  object = (net.sf.saxon.tinytree.TinyNodeImpl) results.get(i);
                System.out.println(object.getNodeKind() + " " +  object.getDisplayName());
                // Some code go here
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
        }

We need to get the output as a string.
<Bar>
<Baz>1</Baz>
<Baz>2</Baz>
</Bar>

<Bar>
<Baz>3</Baz>
<Baz>4</Baz>
<Baz>5</Baz>
<Baz>6</Baz>
</Bar>

Thank you very much for the help.

Sincerely,
Gerald.

[Michael Kay]

First, I would suggest you cast to net.sf.saxon.om.NodeInfo rather than to
net.sf.saxon.tinytree.TinyNodeImpl - NodeInfo is a much more stable and public
interface.

The simplest interface to serialize a NodeInfo object as XML is the static
method net.sf.saxon.query.QueryResult.serialize(NodeInfo node). This sets the
serialization options to indent=yes, omit-xml-declaration=yes, which appears
to be what you are looking for. If you want more control, there is also a
four-argument serialize() method in the same class.

[Anonymous]

Michael
Thank you very much for the help it solve my problem.

Sincerely,
Gerald

[Anonymous]

Hi Michael,
Got another question in returning the values of an attribute, is there a way
for Saxon to return the values of an attribute in an XPath?

XML Input

   <Foo>
              <Bar sample="id1">
                     <Baz>1</Baz>
                     <Baz>2</Baz>
              </Bar>
              <Bar>
                    <Baz>3</Baz>
                    <Baz>4</Baz>
                    <Baz>5</Baz>
                    <Baz>6</Baz>
              </Bar>
     </Foo>

Xpath: /Foo/Bar/Baz/@sample

Below Code:

Configuration config = new Configuration();
        config.setLineNumbering(true);
        config.setAllNodesUntyped(true);
        XPathEvaluator xpath = new XPathEvaluator();
        try {
            StringReader strRead = new StringReader("<Foo><Bar><Baz sample=\"id1\">1</Baz><Baz>2</Baz></Bar><Bar><Baz>3</Baz><Baz>4</Baz><Baz>5</Baz><Baz>6</Baz></Bar></Foo>");
            List results = (List) xpath.evaluate("/Foo/Bar/Baz/@sample", new StreamSource(strRead), XPathConstants.NODESET);
            for (int i=0; i<results.size(); i++) {
                NodeInfo  object = (NodeInfo) results.get(i);
                Properties props = new Properties();
                props.setProperty(OutputKeys.METHOD, "text");
                props.setProperty(OutputKeys.ENCODING, "UTF-8");
                props.setProperty("method", "xml");
                props.setProperty(OutputKeys.INDENT, "yes");
                props.setProperty(OutputKeys.STANDALONE, "true");
                props.setProperty(OutputKeys.MEDIA_TYPE, "text");
                props.setProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
                props.setProperty(SaxonOutputKeys.WRAP, "yes");
                StringWriter sw = new StringWriter();
                QueryResult.serialize(object, new StreamResult(sw), props);
                System.out.println(sw.toString());
                System.out.println("");
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
        }

Exception

net.sf.saxon.event.NoOpenStartTagException: Cannot create an attribute node (sample) whose parent is a document node
    at net.sf.saxon.event.NoOpenStartTagException.makeNoOpenStartTagException(NoOpenStartTagException.java:49)
    at net.sf.saxon.event.TreeReceiver.attribute(TreeReceiver.java:189)
    at net.sf.saxon.tinytree.TinyAttributeImpl.copy(TinyAttributeImpl.java:185)
    at net.sf.saxon.event.TreeReceiver.append(TreeReceiver.java:295)
    at net.sf.saxon.query.QueryResult.serializeSequence(QueryResult.java:187)
    at net.sf.saxon.query.QueryResult.serialize(QueryResult.java:116)
    at com.ti.itg.peit.core.xml.util.XMLUtil.main(XMLUtil.java:110)

Thank you very much.

Sincerely,
Gerald