src/main/java/org/apache/xml/security/keys/keyresolver/implementations/X509SKIResolver.java [51:75]:
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        return x509childNodes != null && x509childNodes.length > 0;
    }

    /** {@inheritDoc} */
    @Override
    protected PublicKey engineResolvePublicKey(
        Element element, String baseURI, StorageResolver storage, boolean secureValidation
    ) throws KeyResolverException {

        X509Certificate cert =
            this.engineResolveX509Certificate(element, baseURI, storage, secureValidation);

        if (cert != null) {
            return cert.getPublicKey();
        }

        return null;
    }

    /** {@inheritDoc} */
    @Override
    protected X509Certificate engineResolveX509Certificate(
        Element element, String baseURI, StorageResolver storage, boolean secureValidation
    ) throws KeyResolverException {
        Element[] x509childNodes =
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src/main/java/org/apache/xml/security/keys/keyresolver/implementations/X509SubjectNameResolver.java [51:75]:
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        return x509childNodes != null && x509childNodes.length > 0;
    }

    /** {@inheritDoc} */
    @Override
    protected PublicKey engineResolvePublicKey(
        Element element, String baseURI, StorageResolver storage, boolean secureValidation
    ) throws KeyResolverException {

        X509Certificate cert =
            this.engineResolveX509Certificate(element, baseURI, storage, secureValidation);

        if (cert != null) {
            return cert.getPublicKey();
        }

        return null;
    }

    /** {@inheritDoc} */
    @Override
    protected X509Certificate engineResolveX509Certificate(
        Element element, String baseURI, StorageResolver storage, boolean secureValidation
    ) throws KeyResolverException {
        Element[] x509childNodes =
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