Hevy code (hevy xml) in the handler

[ander-chan]

I'm traversing the nodes in Domdocument to deserialize/serialize. I've tried visitor and visitorObject() and haven't gotten any results. Is there a way to process data in the handler? One of the problems with UBL is extensions, for example, electronic signatures:

I pulled the serializer into the handler but it returns an empty extension. My cuestion is... Is there another way without using my spaghetti code?

<ext:ExtensionContent>
				<ds:Signature Id="xmldsig-8bc....8-a660-61327289aa2a">
					<ds:SignedInfo>
						<ds:CanonicalizationMethod
							Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" />
						<ds:SignatureMethod
							Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256" />
						<ds:Reference Id="xmldsig-8bcadf1a....660-61327289aa2a-ref0" URI="">
							<ds:Transforms>
								<ds:Transform
									Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature" />
							</ds:Transforms>
							<ds:DigestMethod
								Algorithm="http://www.w3.org/2001/04/xmldsig-more#sha384" />
							<ds:DigestValue>
								BeMJ9+a7liP.....JqKc9M6oSlCzBUFLjH</ds:DigestValue>
						</ds:Reference>
						<ds:Reference URI="#xmldsig-87d128....5-3d9cfa0eec26-keyinfo">
							<ds:DigestMethod
								Algorithm="http://www.w3.org/2001/04/xmldsig-more#sha384" />
							<ds:DigestValue>
								3ZYyqXrGwQa......cMhAo/</ds:DigestValue>
						</ds:Reference>
						<ds:Reference Type="http://uri.etsi.org/01903#SignedProperties"
							URI="#xmldsig-8bcad....1327289aa2a-signedprops">
							<ds:DigestMethod
								Algorithm="http://www.w3.org/2001/04/xmldsig-more#sha384" />
							<ds:DigestValue>
								ujZZlWi7z6L82ayqj...JvbVccliHWPV1lpXsFxv2i2YX</ds:DigestValue>
						</ds:Reference>
					</ds:SignedInfo>
					<ds:SignatureValue Id="xmldsig-8b...a660-61327289aa2a-sigvalue">
						...
						592Y39kpnSrLsHwkSqzGW10hE3WNGO20irI0Yg==
					</ds:SignatureValue>
					<ds:KeyInfo Id="xmldsig-87....9cfa0eec26-keyinfo">
						<ds:X509Data>
							<ds:X509Certificate>
								MIIIODCCBiCgAwIBAgIIbAsHYmJtoOIwDQYJKoZIhvcNAQELBQAwgbQxIzAhBgkqhkiG9w0BCQEW
	                                                          ....
							</ds:X509Certificate>
						</ds:X509Data>
					</ds:KeyInfo>
					<ds:Object>
						<xades:QualifyingProperties
							Target="#xmldsig-8bc....60-61327289aa2a">
							<xades:SignedProperties
								Id="xmldsig-8bcadf1....0-61327289aa2a-signedprops">
								<xades:SignedSignatureProperties>
									<xades:SigningTime>2019-11-28T18:24:12.293-05:00</xades:SigningTime>
									<xades:SigningCertificate>
										<xades:Cert>
											<xades:CertDigest>
												<ds:DigestMethod
													Algorithm="http://www.w3.org/2001/04/xmldsig-more#sha384" />
												<ds:DigestValue>

Thanks and regards!