how to parse (this) xml using Google Script - google-apps-script

Question

I need to parse this xml by Google Script. jsonformatter.org tells me that the XML is valid
I want to get text of ICO but //var ico = root.getChild('Ares_odpovedi').getChild('Odpoved').getChild('VBAS').getChild('ICO').getText(); is throwing an error
The full code is
function getARES() {
var url = 'https://wwwinfo.mfcr.cz/cgi-bin/ares/darv_bas.cgi?'
+ 'ico=06018025'
+ '&xml=1';
var response = UrlFetchApp.fetch(url);
var responseText = response.getContentText(); //.replace(/D:/g,'');
var document = XmlService.parse(responseText);
var root = document.getRootElement();
var ico_tmp0 = root.getName(); // value is "Ares_odpovedi"
var ico_tmp1 = root.getContentSize(); // value is 3
var ico_tmp2 = root.getChild('Ares_odpovedi'); // value is null
var ico_tmp3 = root.getChild('Odpoved'); // value is null
//var ico = root.getChild('Ares_odpovedi').getChild('Odpoved').getChild('VBAS').getChild('ICO').getText();
//var ico = root.getChild('Odpoved').getChild('VBAS').getChild('ICO').getText();
Logger.log(response);
Logger.log(" ");
Logger.log(responseText);
}

Answer 1

I believe your goal as follows.
You want to retrieve the text of ICO using Google Apps Script.
In this case, it is required to use the name space when getChild is used. When this is reflected to your script, it becomes as follows.
Modified script:
function getARES() {
var url = 'https://wwwinfo.mfcr.cz/cgi-bin/ares/darv_bas.cgi?'
+ 'ico=06018025'
+ '&xml=1';
var response = UrlFetchApp.fetch(url);
var responseText = response.getContentText(); //.replace(/D:/g,'');
var document = XmlService.parse(responseText);
var root = document.getRootElement();
// I modified below script.
var ns1 = XmlService.getNamespace("/ares/xml_doc/schemas/ares/ares_answer_basic/v_1.0.3");
var ns2 = XmlService.getNamespace("/ares/xml_doc/schemas/ares/ares_datatypes/v_1.0.3");
var res = root.getChild("Odpoved", ns1).getChild("VBAS", ns2).getChild("ICO", ns2).getText();
Logger.log(res)
}
When above script is run, 06018025 is retrieved.
When http://wwwinfo.mfcr.cz/cgi-bin/ares/darv_bas.cgi?ico=27074358&xml=1 is used as the URL of UrlFetchApp.fetch, 27074358 is obtained.
References:
XML Service
Added:
From your replying of Any idea why var res2 = root.getChild("Odpoved", ns1).getChild("VBAS", ns2).getChild("DIC", ns2).getText(); does not work?, now I noticed that your question had been changed.
In your question, you wanted to retrieve the value of ICO. But in the case for retrieving the value of DIC, it is required to check the structure of XML. Because in your script in your question, the XML from var url = 'https://wwwinfo.mfcr.cz/cgi-bin/ares/darv_bas.cgi?' + 'ico=06018025' + '&xml=1'; doesn't include the value of DIC. I think that this is the reason of your issue.
When you want to retrieve the value of DIC from http://wwwinfo.mfcr.cz/cgi-bin/ares/darv_bas.cgi?ico=27074358&xml=1, please use the following script.
Modified script:
function getARES() {
var url = 'http://wwwinfo.mfcr.cz/cgi-bin/ares/darv_bas.cgi?ico=27074358&xml=1'; // <--- Modified
var response = UrlFetchApp.fetch(url);
var responseText = response.getContentText(); //.replace(/D:/g,'');
var document = XmlService.parse(responseText);
var root = document.getRootElement();
var ns1 = XmlService.getNamespace("/ares/xml_doc/schemas/ares/ares_answer_basic/v_1.0.3");
var ns2 = XmlService.getNamespace("/ares/xml_doc/schemas/ares/ares_datatypes/v_1.0.3");
var res = root.getChild("Odpoved", ns1).getChild("VBAS", ns2).getChild("DIC", ns2).getText(); // <--- Modified
Logger.log(res) // In this case, CZ27074358 is retrieved.
}
Note:
About the name space, these threads might be useful.
What are XML namespaces for?
How does XPath deal with XML namespaces?