Importing xml with external cross references?

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hi all,
please can anyone help me with my problem?

i have xml document with external cross references and i want to import this xml to framemaker and want from fm to make this cross references correctly

but fm has only cross-reference format and cross-reference id property available for the rules...
is there any way how to make atribute for cross-reference id from source element id and also filename of source document? i tried but didnt succeed...

or how to force framemaker to import the text from source document correctly?

thanks very much for any help

acer