Approval error for maps with single quotes in name

Symptoms

When confirming approval of a map on the 'Confirmation of Approvals and Rework' webpage, an unanticipated error is reported

A problem has been encountered. Please see the Triaster knowledge base at www.triaster.co.uk or contact support@triaster.co.uk, with the following error details.
Error Details: System.Xml.XPath.XPathException: 'RevisionHistory/Revisions[@Node='Map with 'single quotes' in name']' has an invalid token.
at MS.Internal.Xml.XPath.XPathParser.CheckToken(LexKind t)
at MS.Internal.Xml.XPath.XPathParser.ParsePredicate(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParseStep(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParseRelativeLocationPath(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParsePathExpr(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParseUnionExpr(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParseMultiplicativeExpr(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParseRelationalExpr(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParseAndExpr(AstNode qyInput)
at MS.Internal.Xml.XPath.XPathParser.ParseExpresion(AstNode qyInput)
at MS.Internal.Xml.XPath.QueryBuilder.Build(String query, Boolean allowVar, Boolean allowKey)
at System.Xml.XPath.XPathExpression.Compile(String xpath, IXmlNamespaceResolver nsResolver)
at System.Xml.XPath.XPathNavigator.Select(String xpath)
at Confirmation.UpdateRevisionHistory(XmlDocument objXMLDoc, String strNode, String strDescription, String strCategory, String strAuthor, String strURL, String strOwner, String strVersionInfo, String strApprover)
at Confirmation.ProcessCollections(Collection colapproval, Collection colrework)
at Confirmation.Button1_Click(Object sender, EventArgs e)

The map's Approval status isn't updated.

Cause

Approving a map with a name that contains characters that may be regarded as special in XML or XPath, such as single-quotes, will cause this error.

Solution

Ensure Node names do not contain such special characters.