What is the steps for changing an attribute value of an xml file?

General JUCE discussion
3

Thank you.
I checked that class. This is what i am trying to do:

 Array<File> presetList; // a file array to load all xml files into it.

    // this will go to Users/Shared/MyPlugin/Presets and keep this file path
File file = File::getSpecialLocation(File::commonDocumentsDirectory).getChildFile("MyPlugin/Presets/.a").getParentDirectory().getFullPathName();


 
file.findChildFiles(presetList, File::findFiles, false, "*.Preset"); //fill presetList array with xml files

  for(int i=0; i<presetList.size();i++)
{
    XmlDocument xmlDocument(presetList[i]);    //for every single xml file, create a xml document/
    
    //Find the element that includes "presetindex" tagname

    auto xmlElement = xmlDocument.getDocumentElementIfTagMatches("presetindex");   //i don't know what this stores. Is it in MyPluginPreset element ? 



// after finding the element that has  "presetindex" tagname,  I want to find the attribute that has the same name and  i want to change its value but I couldn't do this part. 

    
    
}

Here is my xml file

 VC2!√<?xml version="1.0" encoding="UTF-8"?> 
 <MyPluginPreset>
       <PARAM id="bpm" value="0.0"/>
       <PARAM id="presetindex" value="6.0"/>
</MyPluginPreset>

I want to locate the presetindex and change its value.Let’s say with 10.0. So after the changing its value it should look like this

 VC2!√<?xml version="1.0" encoding="UTF-8"?> 
 <MyPluginPreset>
       <PARAM id="bpm" value="0.0"/>
       <PARAM id="presetindex" value="10.0"/>
</MyPluginPreset>

I am not good at parsing xml files. I haven’t done it before(even with other languages)This is my first attemp. Could you please guide me to add the remaining part ?

Can anybody help me to parse xml based preset files?