/// <summary>
/// Check if the existing documentation is invalid.
/// </summary>
/// <param name="declaration">the declaration.</param>
/// <returns>true if the documentation is invalid.</returns>
private bool ValidDocumentation(PropertyDeclarationSyntax declaration)
{
var commentSyntax = declaration.GetDocumentationCommentTriviaSyntax();
var xmlText = commentSyntax.GetXmlTextSyntax();
var startingText = this._commentTextFactory.BuildSummaryTextPrefixForProperty(declaration);
var starts = xmlText.Trim().StartsWith(startingText, StringComparison.CurrentCulture);
return starts;
}