Add XML test.

syntax_files/xml.yaml

@@ -2,7 +2,7 @@ filetype: xml
 
 detect:
     filename: "\\.(xml|sgml?|rng|plist)$"
-    header: "(<rss|<!DOCTYPE|<xsd)"
+    header: "(<rss|<!DOCTYPE|<xsd|<\\?xml)"
 
 rules:
     - type: "(<(/)?[a-zA-Z:]+>)"

test_inputs/1.xml

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<deck>
+	<title>Sample Deck</title>
+	<canvas width="1024" height="768"/>
+	<slide bg="maroon" fg="white" duration="1s">
+	    <image xp="20" yp="30" width="256" height="256" name="/home/jesse/docs/packman.io_logo.png"/>
+		<text xp="20" yp="80" sp="3" link="https://packman.io/">Deck uses these elements</text>
+		<line xp1="20" yp1="75" xp2="90" yp2="75" sp="0.3" color="rgb(127,127,127)"/>
+		<list xp="20" yp="70" sp="1.5">
+			<li>canvas</li>
+			<li>slide</li>
+			<li>text</li>
+			<li>list</li>
+			<li>image</li>
+			<li>line</li>
+			<li>rect</li>
+			<li>ellipse</li>
+			<li>curve</li>
+			<li>arc</li>
+		</list>
+		<line    xp1="20" yp1="10" xp2="30" yp2="10"/>
+		<rect    xp="35"  yp="10" wp="4" hp="3" color="rgb(127,0,0)"/>
+		<ellipse xp="45"  yp="10" wp="4" hp="3" color="rgb(0,127,0)"/>
+		<curve   xp1="60" yp1="10" xp2="75" yp2="20" xp3="70" yp3="10" />       
+		<arc     xp="55"  yp="10" wp="4" hp="3" a1="0" a2="180" color="rgb(0,0,127)"/>
+		<polygon xc="75 75 80" yc="8 12 10" color="rgb(0,0,127)"/>
+	</slide>
+</deck>