NAME¶

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

SYNOPSIS¶

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