powershell xml select attribute value where clause

Question

I have a xml file with the following elements:

Answer 1

The non-XPATH method:

($qrda.ClinicalDocument.recordTarget.patientRole.telecom | Where {$_.use -eq "HP"}).value

Or (thanks to Tomalak's helpful comment), using the comparison statement format:

($qrda.ClinicalDocument.recordTarget.patientRole.telecom | Where use -eq "HP").value

Answer 2

Use XPath. Assuming that $qrda is your XML document:

$path = "/ClinicalDocument/recordTarget/patientRole/telecom[@use='HP']"
$telecom = $qrda.SelectSingleNode($path)

since that path is pretty long and overly specific we can trim it down:

$telecom = $qrda.SelectSingleNode("//telecom[@use='HP']")