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Asked: 2026-06-13T23:11:38+00:00

I’m developing a XML Validation service that uses multiple XML Schema files for validation

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I’m developing a XML Validation service that uses multiple XML Schema files for validation of XML files in my application. XML Schema files use imports heavily. For that reason I need a service, that would associate namespaces to their schema definitions (file locations).

Each XML namespace is defined in separate XSD.

I know I could use schemaLocation attributes to connect schemas with their files, but that would require using lots of relative paths and wouldn’t work well with arbitrary project structures:

<-- schema.xsd -->
<xsd:import namespace="urn.my.namespace" schemaLocation="..."/>

<-- actual.xml -->
<root xmlns="urn.my.namespace"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="urn.my.namespace schema.xsd">
</root>

I would like to create a service that walks throughout bundles, discovers xsd files and registers their namespace – file location association into some kind of registry that would
be available for other XML services.

My Symfony project has the following structure:

AbcBundle/
    Resources/config/services.xml
    Resources/xsd/
        schema.xsd
        ns1.xsd
        ns2.xsd
        ...
    AbcBundle.php
XyzBundle/
    [same structre]

Planned usage:

$nsLocator = $container->get('xml.ns_locator');
$nsLocator->getNamespaceMap();
/* returns array(
    'urn:my:ns1' => '/realpath/to/ns1.xsd',
    'urn:my:ns2' => '/otherpath/to/ns2.xsd',
*/

The $nsLocator should build that map automatically from Bundle/Resources/xsd/ directories.
I like the way that Symfony registers Bundle/Command or Bundle/Controller with its stack.

I was thinking of some kind of event listener that would hook into Kernel and once all Bundles are registered it would scan all XSDs and create a map. If done this way, It would require a caching so it doesn’t rescan all the files every time a new request or a command is executed.

How do I build that component and hook it into kernel? Where is the correct connection point for this component? Is it generally a good approach?

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1 Answer

  1. Editorial Team

    You should be able to create a compiler pass which would be run while the container is being built (after the main pass).

    During your pass, get list of bundles and iterate through them to create a list of xsd files. Finally, pass the list to your service.

    To get list of bundles:

    $container->getParameter('kernel.bundles')

    Read more:

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