Scripting Error

I'm having difficulty figuring this one out.

This script works:

   var myFormat = app.documents[0].crossReferenceFormats.item("Paragraph Text");

   var myXref = app.documents[0].hyperlinks[0];

   myXref.source.appliedFormat = myFormat;

This script gives me an error message:

   var myFormat = app.documents[0].crossReferenceFormats.item("Paragraph Text");

   var myXref = app.documents[0].crossReferenceFormats[0];

   myXref.source.appliedFormat = myFormat;

Now, according to the Document model, crossReferenceFormats is a property and [] is a method for that property. So, it seems to me that as hyperlinks is referring to the index of a specific hyperlink, then crossReferenceFormats should be referring to the index of a specific CrossReferenceFormat.

What am i missing?