[xml] reverse engineering a schema

[David Weinkauf <d weinkauf utoronto ca>]

Hi,

I'm attempting to write a program which displays a schema's content 
model in a 'tree' format. For example, if given the file 'po.xml' found 
in libxml/examples the output would be:

purchaseOrder[ orderDate]
|-- shipTo[ country]
|   |-- name
|   |-- street
|   |-- city
|   |-- state
|   `-- zip
|-- billTo[ country]
|   |-- name
|   |-- street
|   |-- city
|   |-- state
|   `-- zip
|-- comment
`-- items
   `-- item[ partNum,@subNum]
       |-- productName
       |-- quantity
       |-- USPrice
       |-- comment
       `-- shipDate
21 elements

Currently I have a working version, but it requires the internals of 
some of the structures found in xmlregexp.c to become available at the 
API level. This is because I use the content models generated for each 
element after the schema is parsed to achieve the reverse engineering 
and hence, create the tree. What are your thoughts on making the 
internals of 'struct _xmlRegexp' available at the libxml2 API level?

Also, if I'm going about this problem the wrong way, please let me know.

Thanks,

David Weinkauf