[jira] [Created] (XMLSCHEMA-64) Schema walker thinks an element was previously visited when it's not

["Oscar Westra van Holthe - Kind (Jira)" <ji...@apache.org>]

Oscar Westra van Holthe - Kind created XMLSCHEMA-64:
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             Summary: Schema walker thinks an element was previously visited when it's not
                 Key: XMLSCHEMA-64
                 URL: https://issues.apache.org/jira/browse/XMLSCHEMA-64
             Project: XmlSchema
          Issue Type: Bug
            Reporter: Oscar Westra van Holthe - Kind


Consider this schema:
{code:xml}
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="https://www.github.com/opwvhk/schemawalkerbug" xmlns="https://www.github.com/opwvhk/schemawalkerbug"
           xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">
    <xs:element name="RepeatedSubElementNames">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="wrappedStringArray">
                    <xs:complexType>
                        <xs:sequence>
                            <xs:element name="array" minOccurs="0" maxOccurs="unbounded">
                                <xs:complexType>
                                    <xs:sequence>
                                        <xs:element ref="string"/>
                                    </xs:sequence>
                                </xs:complexType>
                            </xs:element>
                        </xs:sequence>
                    </xs:complexType>
                </xs:element>
                <xs:element name="wrappedNumber">
                    <xs:complexType>
                        <xs:sequence>
                            <xs:element name="array" minOccurs="0" maxOccurs="unbounded">
                                <xs:complexType>
                                    <xs:sequence>
                                        <xs:element ref="number"/>
                                    </xs:sequence>
                                </xs:complexType>
                            </xs:element>
                        </xs:sequence>
                    </xs:complexType>
                </xs:element>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:element name="string">
        <xs:complexType>
            <xs:simpleContent>
                <xs:extension base="xs:string"/>
            </xs:simpleContent>
        </xs:complexType>
    </xs:element>
    <xs:element name="number">
        <xs:complexType>
            <xs:simpleContent>
                <xs:extension base="xs:int"/>
            </xs:simpleContent>
        </xs:complexType>
    </xs:element>
</xs:schema>
{code}
When walking this schema, the 2nd {{array}} element is not traversed, resulting in missing the subelements {{{}number{}}}.

 

To fix, in line 241 of {{{}XmlSchemaWalker.java{}}}, only add elements to {{visitedElements}} if they're top-level elements, or if their type is a top-level type.

After all, infinite recursion is only possible using references, and only toplevel elements/types can be referenced.

 

So change this:
{code:java}
if (!element.isAnonymous() && !previouslyVisited) {
    visitedElements.add(element.getQName());
} {code}
Into this:
{code:java}
if (!element.isAnonymous() && !previouslyVisited && (element.isTopLevel() || schemaType.isTopLevel()) {
    visitedElements.add(element.getQName());
} {code}



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