I am thinking to divide my definition xml file into several files.

I do not know if there is a general way, but I found some web pages mentioning about it. According to 
these pages we can include an xml document to  other one like.

---------- booklist.xml ------------
<?xml version="1.0"?>
<!DOCTYPE books [
<!ENTITY book1 SYSTEM "book1.xml">
]>

<books>
  &book1;
</books>
------------------------------------
------------ book1.xml -------------
<?xml version="1.0"?>
<book>
  <title>Title of the book</title>
  <author>Author of the book</author>
</book>
------------------------------------

Is it possible to do it with mxml ?


I have two reasons.
1.
 I have two ROME programs.  I call them as "writer" and "reader" in this message. "reader" reads output 
file from "writer". In this case, "reader" needs to know the structure of branch folder defined in "writer"'s 
xml file.
What I am doing is adding headers of "writer" to DictionaryHeaders in Makefile.user of "reader". At least, 
it works, but this way I have to write reading function of trees by hand. On the other hand, If it is 
possible to include a part of xml file of "writer" in that of "reader", romebuilder can create proper 
functions automatically.

2.
 My project definition file is already big. It has more than 2000 lines. If one has good XML editor, it may 
not be a problem. But unfortunately I do not know good editor on Linux. What I am thinking is making a 
directory structure like this.
.
|-- main_definition.xml
`-- xml
    |-- folders
    |   |-- folder_1.xml
    |   |-- folder_2.xml
    |   `-- folder_3.xml
    `-- tasks
        |-- task_1.xml
        |-- task_2.xml
        `-- task_3.xml

folder_[1-3].xml and task_[1-3].xml will be included in main_definition.xml.