JXPath trouble running query on a nesting element

Question

JXPath trouble running query on a nesting element

13 Views Asked by KC Wong At 20 June 2023 at 07:03

I have this XSD of Jira workflow:

<?xml version="1.0" encoding="utf-8"?>
<!-- 
    Converted from workflow_2_8.dtd using Microsoft Visual Studio  
-->
<xs:schema elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:element name="workflow"> 
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="0" maxOccurs="1000" ref="meta" />
                <xs:element minOccurs="0" maxOccurs="1" ref="registers" />
                <xs:element minOccurs="0" maxOccurs="1" ref="trigger-functions" />
                <xs:element minOccurs="0" maxOccurs="1" ref="global-conditions" />
                <xs:element ref="initial-actions" />
                <xs:element minOccurs="0" maxOccurs="1" ref="global-actions" />
                <xs:element minOccurs="0" maxOccurs="1" ref="common-actions" />
                <xs:element ref="steps" />
                <xs:element minOccurs="0" maxOccurs="1" ref="splits" />
                <xs:element minOccurs="0" maxOccurs="1" ref="joins" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:element name="action">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="0" maxOccurs="unbounded" ref="meta" />
                <xs:element minOccurs="0" maxOccurs="1" ref="restrict-to" />
                <xs:element minOccurs="0" maxOccurs="1" ref="validators" />
                <xs:element minOccurs="0" maxOccurs="1" ref="pre-functions" />
                <xs:element ref="results" />
                <xs:element minOccurs="0" maxOccurs="1" ref="post-functions" />
            </xs:sequence>
            <xs:attribute name="id" type="xs:string" use="required" />
            <xs:attribute name="name" type="xs:string" use="required" />
            <xs:attribute name="view" type="xs:string" />
            <xs:attribute name="auto">
                <xs:simpleType>
                    <xs:restriction base="xs:NMTOKEN">
                        <xs:enumeration value="TRUE" />
                        <xs:enumeration value="FALSE" />
                        <xs:enumeration value="true" />
                        <xs:enumeration value="false" />
                    </xs:restriction>
                </xs:simpleType>
            </xs:attribute>
            <xs:attribute name="finish">
                <xs:simpleType>
                    <xs:restriction base="xs:NMTOKEN">
                        <xs:enumeration value="TRUE" />
                        <xs:enumeration value="FALSE" />
                        <xs:enumeration value="true" />
                        <xs:enumeration value="false" />
                    </xs:restriction>
                </xs:simpleType>
            </xs:attribute>
        </xs:complexType>
    </xs:element>
    <xs:element name="common-action">
        <xs:complexType>
            <xs:simpleContent>
                <xs:extension base="xs:string">
                    <xs:attribute name="id" type="xs:string" use="required" />
                </xs:extension>
            </xs:simpleContent>
        </xs:complexType>
    </xs:element>
    <xs:element name="actions">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="0" maxOccurs="unbounded" ref="common-action" />
                <xs:element minOccurs="0" maxOccurs="unbounded" ref="action" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:element name="arg">
        <xs:complexType>
            <xs:simpleContent>
                <xs:extension base="xs:string">
                    <xs:attribute name="name" type="xs:string" use="required" />
                </xs:extension>
            </xs:simpleContent>
        </xs:complexType>
    </xs:element>
    <xs:element name="conditions">
        <xs:complexType>
            <xs:choice minOccurs="0" maxOccurs="unbounded">
                <xs:element ref="conditions" />
                <xs:element ref="condition" />
            </xs:choice>
            <xs:attribute name="type">
                <xs:simpleType>
                    <xs:restriction base="xs:NMTOKEN">
                        <xs:enumeration value="AND" />
                        <xs:enumeration value="OR" />
                    </xs:restriction>
                </xs:simpleType>
            </xs:attribute>
        </xs:complexType>
    </xs:element>
    <xs:element name="condition">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="0" maxOccurs="unbounded" ref="arg" />
            </xs:sequence>
            <xs:attribute name="type" type="xs:string" use="required" />
            <xs:attribute name="id" type="xs:string" />
            <xs:attribute name="negate" type="xs:string" />
            <xs:attribute name="name" type="xs:string" />
        </xs:complexType>
    </xs:element>
    <xs:element name="external-permissions">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="1" maxOccurs="unbounded" ref="permission" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:element name="function">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="0" maxOccurs="unbounded" ref="arg" />
            </xs:sequence>
            <xs:attribute name="type" type="xs:string" use="required" />
            <xs:attribute name="id" type="xs:string" />
            <xs:attribute name="name" type="xs:string" />
        </xs:complexType>
    </xs:element>
    <xs:element name="global-actions">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="1" maxOccurs="unbounded" ref="action" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:element name="initial-actions">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="1" maxOccurs="unbounded" ref="action" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:element name="common-actions">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="1" maxOccurs="unbounded" ref="action" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:element name="join">
        <xs:complexType>
            <xs:sequence>
                <xs:element ref="conditions" />
                <xs:element ref="unconditional-result" />
            </xs:sequence>
            <xs:attribute name="id" type="xs:string" use="required" />
        </xs:complexType>
    </xs:element>
    <xs:element name="joins">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="0" maxOccurs="unbounded" ref="join" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:element name="meta">
        <xs:complexType>
            <xs:simpleContent>
                <xs:extension base="xs:string">
                    <xs:attribute name="name" type="xs:string" use="required" />
                </xs:extension>
            </xs:simpleContent>
        </xs:complexType>
    </xs:element>
    <xs:element name="permission">
        <xs:complexType>
            <xs:sequence>
                <xs:element ref="restrict-to" />
            </xs:sequence>
            <xs:attribute name="name" type="xs:string" use="required" />
            <xs:attribute name="id" type="xs:string" />
        </xs:complexType>
    </xs:element>
    <xs:element name="post-functions">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="1" maxOccurs="unbounded" ref="function" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:element name="pre-functions">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="1" maxOccurs="unbounded" ref="function" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:element name="register">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="0" maxOccurs="unbounded" ref="arg" />
            </xs:sequence>
            <xs:attribute name="type" type="xs:string" use="required" />
            <xs:attribute name="variable-name" type="xs:string" use="required" />
            <xs:attribute name="id" type="xs:string" />
        </xs:complexType>
    </xs:element>
    <xs:element name="registers">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="1" maxOccurs="unbounded" ref="register" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:element name="restrict-to">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="0" maxOccurs="1" ref="conditions" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:element name="result">
        <xs:complexType>
            <xs:sequence>
                <xs:element ref="conditions" />
                <xs:element minOccurs="0" maxOccurs="1" ref="validators" />
                <xs:element minOccurs="0" maxOccurs="1" ref="pre-functions" />
                <xs:element minOccurs="0" maxOccurs="1" ref="post-functions" />
            </xs:sequence>
            <xs:attribute name="old-status" type="xs:string" use="required" />
            <xs:attribute name="status" type="xs:string" />
            <xs:attribute name="step" type="xs:string" />
            <xs:attribute name="owner" type="xs:string" />
            <xs:attribute name="split" type="xs:string" />
            <xs:attribute name="join" type="xs:string" />
            <xs:attribute name="due-date" type="xs:string" />
            <xs:attribute name="id" type="xs:string" />
            <xs:attribute name="display-name" type="xs:string" />
        </xs:complexType>
    </xs:element>
    <xs:element name="results">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="0" maxOccurs="unbounded" ref="result" />
                <xs:element ref="unconditional-result" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:element name="split">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="1" maxOccurs="unbounded" ref="unconditional-result" />
            </xs:sequence>
            <xs:attribute name="id" type="xs:string" use="required" />
        </xs:complexType>
    </xs:element>
    <xs:element name="splits">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="1" maxOccurs="unbounded" ref="split" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:element name="step">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="0" maxOccurs="unbounded" ref="meta" />
                <xs:element minOccurs="0" maxOccurs="1" ref="pre-functions" />
                <xs:element minOccurs="0" maxOccurs="1" ref="external-permissions" />
                <xs:element minOccurs="0" maxOccurs="1" ref="actions" />
                <xs:element minOccurs="0" maxOccurs="1" ref="post-functions" />
            </xs:sequence>
            <xs:attribute name="id" type="xs:string" use="required" />
            <xs:attribute name="name" type="xs:string" use="required" />
        </xs:complexType>
    </xs:element>
    <xs:element name="steps">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="1" maxOccurs="unbounded" ref="step" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:element name="unconditional-result">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="0" maxOccurs="1" ref="validators" />
                <xs:element minOccurs="0" maxOccurs="1" ref="pre-functions" />
                <xs:element minOccurs="0" maxOccurs="1" ref="post-functions" />
            </xs:sequence>
            <xs:attribute name="old-status" type="xs:string" use="required" />
            <xs:attribute name="status" type="xs:string" />
            <xs:attribute name="step" type="xs:string" />
            <xs:attribute name="owner" type="xs:string" />
            <xs:attribute name="split" type="xs:string" />
            <xs:attribute name="join" type="xs:string" />
            <xs:attribute name="due-date" type="xs:string" />
            <xs:attribute name="id" type="xs:string" />
            <xs:attribute name="display-name" type="xs:string" />
        </xs:complexType>
    </xs:element>
    <xs:element name="trigger-function">
        <xs:complexType>
            <xs:sequence>
                <xs:element ref="function" />
            </xs:sequence>
            <xs:attribute name="id" type="xs:string" use="required" />
        </xs:complexType>
    </xs:element>
    <xs:element name="trigger-functions">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="1" maxOccurs="unbounded" ref="trigger-function" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:element name="validator">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="0" maxOccurs="unbounded" ref="arg" />
            </xs:sequence>
            <xs:attribute name="type" type="xs:string" use="required" />
            <xs:attribute name="name" type="xs:string" />
            <xs:attribute name="id" type="xs:string" />
        </xs:complexType>
    </xs:element>
    <xs:element name="validators">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="1" maxOccurs="unbounded" ref="validator" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:element name="global-conditions">
        <xs:complexType>
            <xs:sequence>
                <xs:element minOccurs="0" maxOccurs="1" ref="conditions" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>

I generated the classes using JAXB. In particular, Conditions class:

//
// This file was generated by the Eclipse Implementation of JAXB, v2.3.7 
// See https://eclipse-ee4j.github.io/jaxb-ri 
// Any modifications to this file will be lost upon recompilation of the source schema. 
// Generated on: 2023.06.13 at 11:10:39 AM HKT 
//


package com.igsl.configmigration.workflow.mapper.generated;

import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElements;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
import javax.xml.bind.annotation.adapters.CollapsedStringAdapter;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
import com.igsl.configmigration.workflow.mapper.WorkflowPart;


/**
 * <p>Java class for anonymous complex type.
 * 
 * <p>The following schema fragment specifies the expected content contained within this class.
 * 
 * <pre>
 * &lt;complexType&gt;
 *   &lt;complexContent&gt;
 *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType"&gt;
 *       &lt;choice maxOccurs="unbounded" minOccurs="0"&gt;
 *         &lt;element ref="{}conditions"/&gt;
 *         &lt;element ref="{}condition"/&gt;
 *       &lt;/choice&gt;
 *       &lt;attribute name="type"&gt;
 *         &lt;simpleType&gt;
 *           &lt;restriction base="{http://www.w3.org/2001/XMLSchema}NMTOKEN"&gt;
 *             &lt;enumeration value="AND"/&gt;
 *             &lt;enumeration value="OR"/&gt;
 *           &lt;/restriction&gt;
 *         &lt;/simpleType&gt;
 *       &lt;/attribute&gt;
 *     &lt;/restriction&gt;
 *   &lt;/complexContent&gt;
 * &lt;/complexType&gt;
 * </pre>
 * 
 * 
 */
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
    "conditionsOrCondition"
})
@XmlRootElement(name = "conditions")
public class Conditions implements WorkflowPart
{

    @XmlElements({
        @XmlElement(name = "conditions", type = Conditions.class),
        @XmlElement(name = "condition", type = Condition.class)
    })
    protected List<Object> conditionsOrCondition;
    @XmlAttribute(name = "type")
    @XmlJavaTypeAdapter(CollapsedStringAdapter.class)
    protected String type;

    /**
     * Gets the value of the conditionsOrCondition property.
     * 
     * <p>
     * This accessor method returns a reference to the live list,
     * not a snapshot. Therefore any modification you make to the
     * returned list will be present inside the JAXB object.
     * This is why there is not a <CODE>set</CODE> method for the conditionsOrCondition property.
     * 
     * <p>
     * For example, to add a new item, do as follows:
     * <pre>
     *    getConditionsOrCondition().add(newItem);
     * </pre>
     * 
     * 
     * <p>
     * Objects of the following type(s) are allowed in the list
     * {@link Condition }
     * {@link Conditions }
     * 
     * 
     */
    public List<Object> getConditionsOrCondition() {
        if (conditionsOrCondition == null) {
            conditionsOrCondition = new ArrayList<Object>();
        }
        return this.conditionsOrCondition;
    }

    /**
     * Gets the value of the type property.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public String getType() {
        return type;
    }

    /**
     * Sets the value of the type property.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setType(String value) {
        this.type = value;
    }

}

And Condition class:

//
// This file was generated by the Eclipse Implementation of JAXB, v2.3.7 
// See https://eclipse-ee4j.github.io/jaxb-ri 
// Any modifications to this file will be lost upon recompilation of the source schema. 
// Generated on: 2023.06.13 at 11:10:39 AM HKT 
//


package com.igsl.configmigration.workflow.mapper.generated;

import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
import com.igsl.configmigration.workflow.mapper.WorkflowPart;


/**
 * <p>Java class for anonymous complex type.
 * 
 * <p>The following schema fragment specifies the expected content contained within this class.
 * 
 * <pre>
 * &lt;complexType&gt;
 *   &lt;complexContent&gt;
 *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType"&gt;
 *       &lt;sequence&gt;
 *         &lt;element ref="{}arg" maxOccurs="unbounded" minOccurs="0"/&gt;
 *       &lt;/sequence&gt;
 *       &lt;attribute name="type" use="required" type="{http://www.w3.org/2001/XMLSchema}string" /&gt;
 *       &lt;attribute name="id" type="{http://www.w3.org/2001/XMLSchema}string" /&gt;
 *       &lt;attribute name="negate" type="{http://www.w3.org/2001/XMLSchema}string" /&gt;
 *       &lt;attribute name="name" type="{http://www.w3.org/2001/XMLSchema}string" /&gt;
 *     &lt;/restriction&gt;
 *   &lt;/complexContent&gt;
 * &lt;/complexType&gt;
 * </pre>
 * 
 * 
 */
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
    "arg"
})
@XmlRootElement(name = "condition")
public class Condition implements WorkflowPart
{

    protected List<Arg> arg;
    @XmlAttribute(name = "type", required = true)
    protected String type;
    @XmlAttribute(name = "id")
    protected String id;
    @XmlAttribute(name = "negate")
    protected String negate;
    @XmlAttribute(name = "name")
    protected String name;

    /**
     * Gets the value of the arg property.
     * 
     * <p>
     * This accessor method returns a reference to the live list,
     * not a snapshot. Therefore any modification you make to the
     * returned list will be present inside the JAXB object.
     * This is why there is not a <CODE>set</CODE> method for the arg property.
     * 
     * <p>
     * For example, to add a new item, do as follows:
     * <pre>
     *    getArg().add(newItem);
     * </pre>
     * 
     * 
     * <p>
     * Objects of the following type(s) are allowed in the list
     * {@link Arg }
     * 
     * 
     */
    public List<Arg> getArg() {
        if (arg == null) {
            arg = new ArrayList<Arg>();
        }
        return this.arg;
    }

    /**
     * Gets the value of the type property.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public String getType() {
        return type;
    }

    /**
     * Sets the value of the type property.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setType(String value) {
        this.type = value;
    }

    /**
     * Gets the value of the id property.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public String getId() {
        return id;
    }

    /**
     * Sets the value of the id property.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setId(String value) {
        this.id = value;
    }

    /**
     * Gets the value of the negate property.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public String getNegate() {
        return negate;
    }

    /**
     * Sets the value of the negate property.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setNegate(String value) {
        this.negate = value;
    }

    /**
     * Gets the value of the name property.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public String getName() {
        return name;
    }

    /**
     * Sets the value of the name property.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setName(String value) {
        this.name = value;
    }

}

You can ignore the interface WorkflowPart, that's just a common interface (with some default methods) I added to handle the classes via generics.

Now I have this XML (pastebin because of size limit here): https://pastebin.com/VhRWrsak

If I run this query, I can find 1 expected single match:

//function[type='class'][arg[name='class.name'][value='com.igsl.customapproval.workflow.postfunction.InitializeApprovalPostFunction']]/arg[name='approvedStatus']

Which is looking for function that contains a particular arg, and return another arg under the same function.

But this query fails to match anything:

//condition[type='class'][arg[name='class.name'][value='com.atlassian.jira.workflow.condition.InGroupCFCondition']]/arg[name='groupcf']

Which is looking for a condition that contains a particular arg, and return another arg under the same condition.

If I omit the part about condition, then I can find a match:

//arg[name='class.name'][value='com.atlassian.jira.workflow.condition.InGroupCFCondition']

I can locate conditions, e.g.

//conditions

But I cannot locate condition, I get 0 match with this:

//condition

It seems to be a bug (because Conditions can contain both Condtions and Condition) but I'm not entirely sure.

These are possible workarounds. It works as long as I don't mention the condition element:

//conditions//arg[name='class.name'][value='com.atlassian.jira.workflow.condition.InGroupCFCondition']/../arg[name='groupcf']
//conditions/*[type='class']/arg[name='class.name'][value='com.atlassian.jira.workflow.condition.InGroupCFCondition']/../arg[name='groupcf']

Here's the testing program:

public static void main(String[] args) throws Exception {
        List<String> workflowXML = Files.readLines(Paths.get(XML_SOURCE).toFile(), Charset.defaultCharset());
        StringBuilder xml = new StringBuilder();
        for (String s : workflowXML) {
            xml.append(s);
        }
        
        SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();
        // Disable DTD validation
        try {
            saxParserFactory.setFeature("http://xml.org/sax/features/external-general-entities", false);
            saxParserFactory.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
            saxParserFactory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
        } catch (SAXNotRecognizedException | SAXNotSupportedException | ParserConfigurationException e) {
            System.out.println("Error configuring SAX Parser");
            e.printStackTrace();
        }
        Source xmlSource = new SAXSource(saxParserFactory.newSAXParser().getXMLReader(),
                new InputSource(new StringReader(xml.toString())));
        JAXBContext ctx = JAXBContext.newInstance(Workflow.class);
        Unmarshaller parser = ctx.createUnmarshaller();
        Workflow wf = (Workflow) parser.unmarshal(xmlSource);
        
        // Test JXPath
        String xpath = "//arg[name='class.name'][value='com.atlassian.jira.workflow.condition.InGroupCFCondition']";
        JXPathContext context = JXPathContext.newContext(wf);
        Iterator<Pointer> it = (Iterator<Pointer>) context.iteratePointers(xpath);
        //Iterator<?> it = context.iterate(xpath);
        if (it != null) {
            if (it.hasNext()) {
                while (it.hasNext()) {
                    Pointer p = it.next();
                    WorkflowPart v = (WorkflowPart) p.getValue();
                    System.out.println(p.asPath() + ": " + v + " (" + v.getWorkflowPartType() + ")");
                }
            } else {
                System.out.println("Not found");
            }
        } else {
            System.out.println(xpath + ": null");
        }

Original Q&A

JXPath trouble running query on a nesting element

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