example.xml is the desired output, but the schema has to repeat the locales for the anyURI variant. Is there any alternative to repeating them?

example.xml

<?xml version="1.0" encoding="UTF-8"?>
<application>
	<title>
		<text xml:lang="de"><![CDATA[]]></text>
		<text xml:lang="en"><![CDATA[]]></text>
		<text xml:lang="fr"><![CDATA[]]></text>
	</title>
	<picture>
		<uri xml:lang="de">file://example1.jpg</uri>
		<uri xml:lang="en">file://example2.jpg</uri>
		<uri xml:lang="fr">file://example3.jpg</uri>
	</picture>
</application>

localized_fields.rnc

namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"
namespace xml = "http://www.w3.org/XML/1998/namespace"
namespace xsd = "http://www.w3.org/2001/XMLSchema-datatypes"

start =
  element application {
    element title { _text },
    element picture { _uri },
  }

_text =
  element text {
    attribute xml:lang { 'de' },
    xsd:string
  },
  element text {
    attribute xml:lang { 'en' },
    xsd:string
  },
  element text {
    attribute xml:lang { 'fr' },
    xsd:string
  }

_uri =
  element uri {
    attribute xml:lang { 'de' },
    xsd:anyURI
  },
  element uri {
    attribute xml:lang { 'en' },
    xsd:anyURI
  },
  element uri {
    attribute xml:lang { 'fr' },
    xsd:anyURI
  }