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Re: YAML module issue

by ingy (Initiate)
on May 13, 2006 at 07:06 UTC ( #549193=note: print w/replies, xml ) Need Help??


in reply to YAML module issue

Well it's like this. In YAML, every document has a "schema" which determines exactly what type or tag every node in the document has. For two applications to share a document, they need to agree on a "schema".

I quote "schema" because it isn't really a tangible thing like XML schema language. In YAML, there is not yet an official schema language.

A YAML schema can come in one of the following forms:

  • Every scalar is a string. This is (or at least should be) the default schema for your general purpose YAML Dumper/Loader.
  • YAML implicit typing is honored. (Implicit typing is what turns 07102 into 3650) This is usually not the default, but some processors might choose this.
  • The YAML Loader/Dumper chooses a schema of its own. This is in effect what all loader/dumpers should do. Basically it means that it can load whatever it dumped into the same internal structure.
  • The application chooses the schema. This is used when every scalar is a string, usually. The program says, "oh the string at $y->{event}{date} should be a date object".
  • An external schema document can be used to declare the type of each node. Nobody does this yet.

YAML.pm's strategy is to load all unquoted scalars as strings except for ~ which becomes undef.

If you want to use YAML.pm with other yaml processors you need to agree on a schema, which really means you need to find out what they do and make sure everything is in sync for your needs.

Cheers, Ingy

Replies are listed 'Best First'.
Re^2: YAML module issue
by devnul (Monk) on May 17, 2006 at 01:37 UTC
    I agree with everything you've said. Is there some way to make YAML.pm quote all scalars so that I can make it agree with the "schema" of a Loader that doesn't allow much adjustment?

    dEvNuL

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