building xml document using xsd

i have a set of data (extracted with a perl script from an xml document) and an xsd. i am trying to build a valid xml document using the schema and the data. i've been trying to do it by generating a sample xml document (in xmlspy) and putting the data elements where they go (according to the sample document) using various perl/xml modules. i have yet to make this work. is there a good way to do this (preferably compatible with perl, since i have to generate xml docs from thousands of data sets)?
tia,
naomi