<?xml version="1.0" encoding="UTF-8" ?>
<?xml-stylesheet type="text/xsl" href="https://community.appian.com/cfs-file/__key/system/syndication/rss.xsl" media="screen"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" xmlns:wfw="http://wellformedweb.org/CommentAPI/"><channel><title>what is a! and why we use it in expressions?</title><link>https://community.appian.com/discussions/f/general/23832/what-is-a-and-why-we-use-it-in-expressions</link><description>a!</description><dc:language>en-US</dc:language><generator>Telligent Community 12</generator><item><title>RE: what is a! and why we use it in expressions?</title><link>https://community.appian.com/thread/91640?ContentTypeID=1</link><pubDate>Mon, 28 Feb 2022 09:28:12 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:fc037fd3-623d-4e21-99b2-2fcc21b4a607</guid><dc:creator>Stewart Burchell</dc:creator><description>&lt;p&gt;One of our Trainers once jokingly said &amp;quot;fn! is the domain for the set of functions, and a! is the domain for &lt;strong&gt;a&lt;/strong&gt;nother set of functions!&amp;quot;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: what is a! and why we use it in expressions?</title><link>https://community.appian.com/thread/91619?ContentTypeID=1</link><pubDate>Sun, 27 Feb 2022 11:43:10 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:bfc1d69c-13c3-4f9c-88e7-7ec472a37882</guid><dc:creator>Harshit Bumb (Appyzie)</dc:creator><description>&lt;p&gt;Hi there,&lt;/p&gt;
&lt;p&gt;AFAIK, a! is used to precisely identify which function belongs to Appian and which functions do not (custom functions, expression rules, interfaces, decisions, etc). However, there are some functions that do not start with a! even after being Appian&amp;#39;s native functions.&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: what is a! and why we use it in expressions?</title><link>https://community.appian.com/thread/91618?ContentTypeID=1</link><pubDate>Sun, 27 Feb 2022 08:05:00 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:3580b627-f9c5-4348-9fd8-7d0bd8524581</guid><dc:creator>Stefan Helzle</dc:creator><description>&lt;p&gt;The Appian documentation will help you with this question.&lt;/p&gt;
&lt;p&gt;&lt;a href="https://docs.appian.com/suite/help/21.4/domain_prefixes.html"&gt;docs.appian.com/.../domain_prefixes.html&lt;/a&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item></channel></rss>