FreeTDS, PHP accessing xml field type

hello, 
i'm using freeTDS to access a Microsoft SQL Server 2005. we installed the last stable version (0.91) of freetds in a x64 red hat linux distribution from rpm. after installing we recompiled php and Mssql module , the freetds configuration file is this 


Compile-time settings (established with the "configure" script) 
Version: freetds v0.91 
freetds.conf directory: /usr/local/etc 
MS db-lib source compatibility: no 
Sybase binary compatibility: no 
Thread safety: yes 
iconv library: yes 
TDS version: 7.2 
iODBC: no 
unixodbc: yes 
SSPI "trusted" logins: no 
Kerberos: no 


i can connect to ms sql server db and retrieve data from any field exept from xml field type. when my query contain an xml filed type an error occur " query error ".
anybody can help me to sort it out? 
hope to receive soon as possible an help from the community; we really need to access that kind of field for our project related to the dissemination of Italian 2011 agriculture census data. 

Antonio Pitrone