String Function

Question

I have...

Dim strXML as string="<NewDataSet>

<USPWEB>

<NUMBER>4112344112344113</NUMBER>

<CTYPE>VI</CTYPE>

<EXPIRATION>0623</EXPIRATION>

<ACCOUNT>2036220196290</ACCOUNT>

<STATUS>A</STATUS>

<DEFAULT>N</DEFAULT>

<TYPE>R</TYPE>

<DATE>2016-04-11T11:02:13-04:00</DATE>

<ACCOUNTREFID>100001</ACCOUNTREFID>

<NTITY>BILLPAY</NTITY>

<STRRETVAL>99</STRRETVAL>

</USPWEB>

</NewDataSet>"

Now I want a function(strXML.<someFunction>) where I can find the value for STRRETVAL is 99

* STRRETVAL can have any number or character