Nope, these are only deprecated which means that you can still use in application/scripts for this version. But this is in list of discontinued feature which will impact the application/scripts if used after discontinued. They can still be used for workload analysis. As per below links, in SQL 2014, there is no as such feature that will break the application, only have behavior change where XML used. Below are excerpts from article mentioned. In earlier versions of SQL Server, queries against an XML document that contains strings over a certain length (more than 4020 characters) can return incorrect results. In SQL Server 2014, such queries return the correct results.
https://msdn.microsoft.com/en-us/library/ms143179(v=sql.120).aspxhttps://msdn.microsoft.com/en-us/library/ms143359.aspx Also, run upgrade advisor before upgrading it. It will give healthy idea about new versions impact.