in reply to Caching Entities with XML::LibXML

I think the answer is "sort of." You are doing a validate() or is_valid() call, right? It is a minor pita but if that's right you can use a system path to a local copy of the same DTD. I have done this but it's been a while and I can't reach my old code tree right now. See XML::LibXML::Dtd for a bit more. HTML::DTD might make it a little less painful, maybe.

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Re^2: Caching Entities with XML::LibXML
by ikegami (Patriarch) on Feb 24, 2010 at 22:36 UTC

    I think the answer is "sort of." You are doing a validate() or is_valid() call, right?

    No, just a simple parse. Specifying validation => 0 doesn't stop the behaviour. The parser needs the DTD to know that   is character U+00A0. I don't see how to tell the parser to use a preconstructed XML::LibXML::Dtd object.

    On the other hand, HTML::DTD does provide a handy source for the DTDs for one's ext_ent_handler. ( ... or not. It doesn't provided xhtml-lat1.ent which is required by xhtml1-strict.dtd )

    I just noticed something called "XML catalogs" in the Parser documentation. It sounds like a simple solution, and it sounds like it allows reuse of the compiled DTDs.

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      Well, this is very interesting. Please update the OP or thread with your final solution, as it were.

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        • XML::LibXML doesn't cache the parsed DTDs it finds via catalogs or any other means (as far as I can tell). Nothing can be done about this.
        • Catalogs can be used to tell where to find a number of DTDs.
        • DTDs named in catalogs can be stored locally.
        • The location of DTDs can be relative to the catalog, or absolute urls.
        • XML::LibXML parses the catalog once per process.
        • XML::LibXML loads the DTDs it finds in catalogs on demand.
        • The last two points mean a catalog can contain DTDs that are rarely used, if ever.

        I'm going to create XML::Catalogs (common code) and XML::Catalogs::HTML (installs and loads catalog of HTML DTDs). All you'll need to do to prevent the download of HTML DTDs will be: 

        use XML::Catalogs::HTML -libxml;

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        For users unable to alter their system configuration,
        for users unaware of the need to alter their system configuration,
        for the simplicity of installing a Perl package,
        for integration with Perl's dependency system,

        XML::Catalogs and XML::Catalogs::HTML are now on CPAN.

        (I got pod errors, I misspelled "dependency", and I could improve the description of the purpose of the module. Let me know if you have comments or if you want more features.)

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