public XmlAttributeValuePattern withNamespace(ElementPattern<String> namePattern) {
    return with(new PsiNamePatternCondition<>("withNamespace", namePattern) {
      @Override
      public String getPropertyValue(@NotNull final Object o) {
        if (o instanceof XmlAttributeValue) {
          final PsiElement parent = ((XmlAttributeValue)o).getParent();
          if (parent instanceof XmlAttribute) {
            return ((XmlAttribute)parent).getNamespace();
          }
        }
        return null;
      }
    });
  }
public XmlAttributeValuePattern withNamespace(ElementPattern<String> namePattern)