public List<URL> getPolicyDefinitionResources() {
        List<URL> resources = new ArrayList<>();
        Enumeration<? extends ZipEntry> entries = this.pluginArtifactZip.entries();
        while (entries.hasMoreElements()) {
            ZipEntry zipEntry = entries.nextElement();
            if (zipEntry.getName().toLowerCase().startsWith("meta-inf/apiman/policydefs/") && zipEntry.getName().toLowerCase().endsWith(".json")) {
                try {
                    resources.add(extractResource(zipEntry));
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
        }
        return resources;
    }
@return gets any policy definition resources from the plugin artifact (located in META-INF/apiman/policyDefs/*.json
common/plugin/src/main/java/io/apiman/common/plugin/PluginClassLoader.java