NAME

stag-autoschema.pl - writes the implicit stag-schema for a stag file

SYNOPSIS

stag-autoschema.pl -w sxpr sample-data.xml

stag-autoschema.pl -dtd sample-data.xml

DESCRIPTION

Takes a stag compatible file (xml, sxpr, itext), or a file in any format plus a parser, and writes out the implicit underlying stag-schema

stag-schema should look relatively self-explanatory.

Here is an example stag-schema, shown in sxpr syntax:

(db
 (person*
  (name "s"
  (address+
   (address_type "s")
   (street "s")
   (street2? "s")
   (city "s")
   (zip? "s")))))

The database db contains zero or more persons, each person has a mandatory name and at least one address.

The cardinality mnemonics are as follows:

+

1 or more

?

0 or one

*

0 or more

The default cardinality is 1

ARGUMENTS

-p|parser FORMAT

FORMAT is one of xml, sxpr or itext, or the name of a perl module

xml assumed as default

-dtd

exports schema as DTD

-w|writer FORMAT

FORMAT is one of xml, sxpr or itext, or the name of a perl module, OR DTD

The default is sxpr

note that stag schemas exported as xml will be invalid xml, due to the use of symbols *, +, ? in the node names

LIMITATIONS

not event based - memory usage becomes exhorbitant on large files; prepare a small sample beforehand