When creating an XML document, it's important to ensure that it's well formed — in other words, we need to make sure that we're following XML syntax rules, or an XML processor won't process the markup and will instead display errors. We've learned all the rules of XML syntax, so let's check and see if our document is well-formed, even in its unfinished state.
When working with a code editor to create XML, there isn't always a built-in way to check if an XML document is well-formed. For example, while Notepad++ has add-ons available that will enable you to check the well-formedness of your XML, Brackets doesn't currently have any available. However, there are plenty of sites available online that will allow you to check to see if your document is well-formed. For our purposes, we'll be using XML Validation.com's XML Validator to check the well-formedness of job_postings.xml. The XML Validation site allows us to copy and paste an XML document into the site to check and see if a document follows proper XML syntax, as well as check to see if our XML is valid by checking it against a schema. We'll learn a little more about schemas later - for now, let's copy and paste our XML document into XML Validation to see if it's well-formed.