try the following stylesheet
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:ad="example.com">
<xsl:strip-space elements="*"/>
<xsl:output indent="yes"/>
<xsl:template match="/">
<ad:AcceptDataInfo xmlns:ad="example.com">
<ad:ServerIP>
<xsl:value-of select="Documents/Document/Prop[Name='ServerIP']/Value"/>
</ad:ServerIP>
<ad:FilePath>
<xsl:value-of select="concat('\\', Documents/Document/Prop[Name='ServerIP']/Value, '\Hardcoded folder\', Documents/Document/Prop[Name='FileNameField.BookingCentre']/Value, '\', Documents/Document/Prop[Name='FileNameField.MainType']/Value, '\', Documents/Document/Prop[Name='FileNameField.SubType']/Value)"/>
</ad:FilePath>
<ad:FileName>
<xsl:value-of select="Documents/Document/Prop[Name='File Name']/Value"/>
</ad:FileName>
<ad:XMLFilePath>
<xsl:value-of select="concat('\\', Documents/Document/Prop[Name='ServerIP']/Value, '\Hardcoded folder\XML')"/>
</ad:XMLFilePath>
<ad:XMLFileName>
<xsl:value-of select="concat(substring-before(Documents/Document/Prop[Name='File Name']/Value, '.'), '.XML')"/>
</ad:XMLFileName>
<ad:PhysicalLocation>
<xsl:value-of select="Documents/Document/Prop[Name='PhysicalLocation']/Value"/>
</ad:PhysicalLocation>
<ad:BookingCentre>
<xsl:value-of select="Documents/Document/Prop[Name='FileNameField.BookingCentre']/Value"/>
</ad:BookingCentre>
<ad:MainType>
<xsl:value-of select="Documents/Document/Prop[Name='FileNameField.MainType']/Value"/>
</ad:MainType>
<ad:SubType>
<xsl:value-of select="Documents/Document/Prop[Name='FileNameField.SubType']/Value"/>
</ad:SubType>
<ad:AccountNo>
<xsl:value-of select="Documents/Document/Prop[Name='FileNameField.AccountNo']/Value"/>
</ad:AccountNo>
<ad:Date>
<xsl:value-of select="Documents/Document/Prop[Name='FileNameField.Date']/Value"/>
</ad:Date>
<ad:Time>
<xsl:value-of select="Documents/Document/Prop[Name='FileNameField.Time']/Value"/>
</ad:Time>
</ad:AcceptDataInfo>
</xsl:template>
</xsl:stylesheet>