public static PsiReference[] create(XmlAttribute attribute, boolean isDeclaration) {
    final String value = attribute.getValue();
    if (value == null) {
      return PsiReference.EMPTY_ARRAY;
    }
    if (value.trim().indexOf(' ') != -1) {
      // TODO: fix for xslt 2.0
      return PsiReference.EMPTY_ARRAY;
    }
    return createImpl(attribute, isDeclaration, value);
  }
public static PsiReference[] create(XmlAttribute attribute, boolean isDeclaration)