Q:

Validate XML against two XSDs for Google Images sitemap

I have an XML file (a sitemap using Google's <image:image> extensions) that I need to validate against the two local XSD files, but validation fails because <url> doesn't allow <image:image> as a child.  The full error message is
org.xml.sax. SAXParseException: 
cvc-complex-type.2.4.a: Invalid content was found starting with element 'image:image'. 
One of '{"http://www.sitemaps.org/schemas/sitemap/0.9":lastmod, 
         "http://www.sitemaps.org/schemas/sitemap/0.9":changefreq, 
         "http://www.sitemaps.org/schemas/sitemap/0.9":priority}' 
is expected. 

Here's the sitemap XML I'm trying to validate:
<? xml version="1.0"? >
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
        xmlns:image="http://www.google.com/schemas/sitemap-image/1.1">
  <url>
    <loc>http://example.com/index.html</loc>
    <image:image>
      <image:loc>http://example.com/images/mysite.jpg</image:loc>
      <image:title>My Site's Logo</image:title>
      <image:caption>Logo for My Site by Andy Warhol (not really)</image:caption>
    </image:image>
  </url>
  ...
</urlset>

I'm using the standard XSDs for sitemaps and Google Images, but since neither references the other I don't see how to make <image:image> a valid child of <url>. 
If it helps, here is the code that performs the validation. 
Source document = ...
StreamSource[] source = new StreamSource[] {
        new StreamSource(this.getClass().getResourceAsStream("sitemap.xsd"), "http://www.sitemaps.org/schemas/sitemap/0.9"),
        new StreamSource(this.getClass().getResourceAsStream("sitemap-image.xsd"), "http://www.google.com/schemas/sitemap-image/1.1")
    };
SchemaFactory.newInstance(XMLConstants. W3C_XML_SCHEMA_NS_URI).newSchema(source)
             .newValidator().validate(document);

The closest SO question I could find requires pre-parsing and splitting up the XML file because the schema to apply varies based on data values.  My requirement is much simpler and I would hope much easier to solve. 
Update: I had the old schema that didn't allow any other children for the  element.  sitemaps.org has updated their XSD to add
<xsd:any namespace="##other" minOccurs="0" maxOccurs="unbounded" processContents="strict"/>

A:

Actually, the sitemap schema allows any element at that location as long as it is from another name space and provided there is a schema around (since the "processContent" is strict.  However, your <image> data is not valid, <caption> must appear before <title>. 
When I test it on Java 1.6, it validates OK.