Generating XML data

- The libxml2 library allows you to modify … xml data by adding a new element or node. … In this code, the sample xml document is updated … with a new key and data. … After opening and validating the document, … a new child node is created for the root node … by using the xmlNewTextChild function … at line 38. … The tag is "spouse" and the content is … "Martha". … Line 46 saves the updated file, … overriding the original. … Appropriate messages are output. … I've already compiled and linked the program. … And the file was updated. … Now, let's concatenate it to see what it looks like. … And you see the new tag inserted at the last line, … it's rather inelegant, but the data is there. … To add a new element beyond the top level, … the code must search for a specific child tag. … Starting at line 37, … this code looks for the name element, … which is just under the root level in the document. … Once found, the xml new text child function … at line 44, … adds the middle tag with the value …