解析PHP生成的(从.xsd模板)XML文件

我正在尝试解析XML (在Objective-C)文件，这是在PHP中从模板生成的，如下所示。

我试过用标准的XML解析器解析这个，但似乎没有加载。

解析这个PHP XML生成的文件的最好方法是什么?也许是第三方图书馆?

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:pbu="http://www.something.com/something.xsd" xmlns="http://www.something.com/something.xsd" elementFormDefault="qualified" targetNamespace="http://www.something.com/something.xsd" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="app">
    <xs:complexType>
        <xs:sequence>
            <xs:element name="bannerImg" type="xs:anyURI" minOccurs="1" maxOccurs="1" />
            <xs:element name="category" minOccurs="1" maxOccurs="25">
                <xs:complexType>
                    <xs:sequence>
                        <xs:element name="image" minOccurs="1" maxOccurs="40">
                            <xs:complexType>
                                <xs:sequence>
                                    <xs:element name="title" type="xs:string" minOccurs="1" maxOccurs="1" />
                                    <xs:element name="thumbUrl" type="xs:anyURI" minOccurs="1" maxOccurs="1" />
                                    <xs:element name="sampleUrl" type="xs:anyURI" minOccurs="0" maxOccurs="1" />
                                    <xs:element name="imageUrl" type="xs:anyURI" minOccurs="1" maxOccurs="1" />
                                    <xs:element name="description" type="xs:string" minOccurs="0" maxOccurs="1" />
                                    <xs:element name="infoUrl" type="xs:anyURI" minOccurs="0" maxOccurs="1" />
                                    <xs:element name="license" type="xs:string" minOccurs="1" maxOccurs="1" />
                                    <xs:element name="licenseUrl" type="xs:anyURI" minOccurs="0" maxOccurs="1" />
                                </xs:sequence>
                            </xs:complexType>
                        </xs:element>
                    </xs:sequence>
                    <xs:attribute name="name" type="xs:string" use="required" />
                    <xs:attribute name="icon" type="xs:anyURI" use="required" />
                    <xs:attribute name="unlock_product_id" type="xs:string" use="required" />
                </xs:complexType>
            </xs:element>
        </xs:sequence>
        <xs:attribute name="name" type="xs:string" use="required" />
        <xs:attribute name="unlock_product_id" type="xs:string" use="optional" />
    </xs:complexType>
</xs:element>
</xs:schema>