NAME

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


SYNOPSIS

  stag-autoschema.pl -w sxpr 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