Count values inside an xslt array - xslt

Question

I'm inserting values into xslt array and I'm trying to Count the each values inside it.
Here is my XSLT style sheet.
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:map="http://www.w3.org/2005/xpath-functions/map"
xmlns:array="http://www.w3.org/2005/xpath-functions/array" exclude-result-prefixes="#all"
version="3.0">
<xsl:output omit-xml-declaration="yes" indent="yes"/>
<xsl:param name="input"/>
<xsl:variable name="newline" select="'
'"/>
<xsl:template match="/" name="xsl:initial-template">
<root>
<xsl:variable name="a" select="A"/>
<xsl:variable name="b" select="B"/>
<xsl:variable name="c" select="C"/>
<xsl:variable name="d" select="D"/>
<xsl:variable name="array">
<xsl:value-of select="$a"/>
<xsl:value-of select="$a"/>
<xsl:value-of select="$b"/>
<xsl:value-of select="$c"/>
<xsl:value-of select="$d"/>
</xsl:variable>
<test>
<xsl:value-of select="count($array[. = 'A'])"/>
</test>
</root>
</xsl:template>
</xsl:stylesheet>
But I'm getting below error.
Engine name: Saxon-PE 9.9.1.7
Severity: fatal
Problem ID: XPDY0002
Description: The context item for axis step ./A is absent
Start location: 14:48
URL: http://www.w3.org/TR/xpath20/#ERRXPDY0002
Suggestions would be also helpful..

Answer 1

What is e.g. <xsl:variable name="a" select="A"/> supposed to do? Bind the value selected from any A elements to the variable a? Or do you want to bind the string 'A' there? Then you need select="'A'".
And if you have some variables and want a sequence of various values use e.g. $A, $A, $B, $C, $D e.g <xsl:variable name="sequence" select="$A, $A, $B, $C, $D"/>.