org.w3c.dom.Node.setNodeValue() not encoding certain special characters

Using Java, I set the value of a <value> attribute in an xml file to be

String val = "~!@#$%^&*()_+-={}|[]\\:\";'<>?,./;"

When I tried to use the api with input

org.w3c.dom.Node.setNodeValue(val)

and take a look at the xml, I see that the value attribute in the resulting xml looks this way-

<Value>~!@#$%^&*()_+-={}|[]\:";'<>?,./</Value>

I'm trying to figure out why this third party API is encoding only < and &, but not >, ' or ".