Parsing XSD and getting nested elements

问题

After going through this page, I wrote the following code to parse an XSD file. However I only get the root element, and I am lost so as to how to get the nested elements inside it. Code:

            XMLSchemaLoader loader = new XMLSchemaLoader();
            XSModel model = loader.loadURI(url.toURI().toString());
            XSNamedMap map = model.getComponents(XSConstants.ELEMENT_DECLARATION);  //returns the root component 

            if(map!=null ){
                for (int j=0; j<map.getLength(); j++) {
                   String name = map.item(j).getName(); //returns 'country' correctly.                    
                }
            }

I am not posting the entire xsd, but this is the structure:

<xsd:element name="country">
    <xsd:complexType>
        <xsd:annotation>
                <xsd:appinfo id="substring">No</xsd:appinfo>                                                
        </xsd:annotation>
        <xsd:sequence minOccurs="1" maxOccurs="unbounded">
            <xsd:element name="states"  minOccurs="1" maxOccurs="1" >
                <xsd:complexType>
                    <xsd:annotation>
                            <xsd:appinfo id="substring">No</xsd:appinfo>                                                
                    </xsd:annotation>
                    <xsd:sequence>
                        <xsd:element name="cities" minOccurs="1" maxOccurs="unbounded">
                        </xsd:element>
                    </xsd:sequence>
                    <xsd:attribute name="name" type="xsd:string" />
                </xsd:complexType>
            </xsd:element>
        </xsd:sequence>
        <xsd:attribute name="name" type="xsd:string"></xsd:attribute>
    </xsd:complexType>
</xsd:element>

I am looking to read all the elements, not just the base element, and not sure how to proceed. Thanks for the help.

回答1:

I think your trying to iterate over the XSNamedMap incorrectly. The reason you are getting only the country element is because it is the root element. You will probably have to descend down into XSNamespaceItem and call getComponents to retrieve another set of XSNamedMap objects.

This will properly parse the XSD but you still have to traverse the tree.

来源：https://stackoverflow.com/questions/8069358/parsing-xsd-and-getting-nested-elements

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xsd