Is this the right way to make a dtd?

if i have an xml file like this:

<books>
    <book>

        <title></title>
        <subtitle></subtitle>
        <info language="">

            <pages></pages>
            <chapters></chapters>

        </info>

        <author></author>

    </book>
    .
    .
    .
</books>

which one of this is the right dtd? FIRST WAY

    <!ELEMENT books(book+)>
    <!ELEMENT book(title,subtitle,info,author)>
    <!ELEMENT title (#PCDATA)>
    <!ELEMENT subtitle (#PCDATA)>
    <!ELEMENT info(pages,chapters)>
    <!ELEMENT pages (#PCDATA)>
    <!ELEMENT chapters(#PCDATA)>
    <!ELEMENT author(#PCDATA)>
    <!ATTLIST info language CDATA #REQUIRED>

SECOND WAY

   <!ELEMENT books(book+)>
   <!ELEMENT book(title,subtitle,info,author)>
   <!ELEMENT info(pages,chapters)>
   <!ELEMENT title (#PCDATA)>
   <!ELEMENT subtitle (#PCDATA)>
   <!ELEMENT pages (#PCDATA)>
   <!ELEMENT chapters(#PCDATA)>
   <!ELEMENT author(#PCDATA)>
   <!ATTLIST info language CDATA #REQUIRED>

So my questions are:

If i have a nested node do i write it at the start or as soon is encounter it?
Can i write attributes at the bottom or as soon is encounter it?

thanx if anyone will reply and sorry for my english.

Solution

Both cases do work after you add some spaces:
The first one can be:

<!DOCTYPE stylesheet [
    <!ELEMENT books (book+)>
    <!ELEMENT book (title,subtitle,info,author)>
    <!ELEMENT title (#PCDATA)>
    <!ELEMENT subtitle (#PCDATA)>
    <!ELEMENT info (pages,chapters)>
    <!ELEMENT pages (#PCDATA)>
    <!ELEMENT chapters (#PCDATA)>
    <!ELEMENT author (#PCDATA)>
    <!ATTLIST info language CDATA #REQUIRED>
]>
<books>
    <book>
        <title></title>
        <subtitle></subtitle>
        <info language="">
            <pages></pages>
            <chapters></chapters>
        </info>
        <author></author>
    </book>
    .
    .
    .
</books>

And the second one can be:

<!DOCTYPE stylesheet [
   <!ELEMENT books (book+)>
   <!ELEMENT book (title,subtitle,info,author)>
   <!ELEMENT info (pages,chapters)>
   <!ELEMENT title (#PCDATA)>
   <!ELEMENT subtitle (#PCDATA)>
   <!ELEMENT pages (#PCDATA)>
   <!ELEMENT chapters (#PCDATA)>
   <!ELEMENT author (#PCDATA)>
   <!ATTLIST info language CDATA #REQUIRED>
]>
<books>
    <book>
        <title></title>
        <subtitle></subtitle>
        <info language="">
            <pages></pages>
            <chapters></chapters>
        </info>
        <author></author>
    </book>
    .
    .
    .
</books>

In both cases you have to add a space after the element's name.
The result is the same in both cases.
That's the whole thing you need to fix/change.