Accessing parent node attributes in XML with repeated tags

I have an xml file with a structure like this:

<model xmlns="http://www.ataccama.com">
    <entities>
        <entity name="table1" />
     <columns>
             <column datatype="varchar(100)" name="abc" required="false" />
             <column datatype="int" name="xyz" required="false" />
             <column datatype="datetime" name="123" required="false" />
     </columns>
...

I want to produce a data stream that combines the column name and data_type with the name from the parent entity node.  If I define the columns using xpath nm:model/nm:entitles/nm:entity/nm:columns/nm:column then I cannot access the entity name using ../../@name (or any xpath expression for that matter).  If I define the columns using entity level xpath epxression nm:model/nm:entitles/nm:entity and the columns with xpath nm:columns/nm:column/@name then I only get 1 record per entity with the first column only.   How can I get the entity name, column name, and column data_type on each line?