Tests at www.csceurope.org/covax_demo:

Poster-Collection (search index based on the Amico2in1-dtd):

Search for amico identifiers
_xql=am_object[(am_object//AID__amico_identifier~="*10*")]

Search for title object names
_xql=am_object[(am_object//OTN__object_title_name~="Aus*")]

More complex searches:
_xql=am_object[((am_object//AID__amico_identifier~="*10*") or (am_object//AID__amico_identifier~="*11*")) and not (am_object//AID__amico_identifier~="10")]

Count (delivers number of hits - not the hits themselves ! ):
_xql=count(am_object[(am_object//AID__amico_identifier~="*10*")])      --->  4 hits
_xql=count(am_object[(am_object//OTN__object_title_name~="Aus*")])  --->17 hits

Range (these are the same examples as "count" only with a range specified - xql(x,y) will return y results starting from result-set-position x )
_xql(2,3)=am_object[(am_object//AID__amico_identifier~="*10*")]
_xql(5,10)=am_object[(am_object//OTN__object_title_name~="Aus*")]

ENEA-Collection (search index based on the DC-dtd; 'dc-title' ~ 'mrcb245-a', ...):

Search for dc-title
_xql=mrcb[(mrcb//dc-title="Energi*")]

Search for dc-date
_xql=mrcb[mrcb//dc-date-date $BETW$ "1960", "1980"]

Count (delivers number of hits - not the hits themselves ! ):
_xql=count(mrcb[(mrcb//dc-title="Energi*")])      --->  2 hits  

Range (these are the same examples as "count" only with a range specified - xql(x,y) will return y results starting from result-set-position x ) 
_xql(1,1)=mrcb[(mrcb//dc-title="Energi*")]

_xql(1,5)=mrcb[(mrcb//dc-title="Energi*")]
     Note: if x + y - 1 > count less than y results will be returned.
_xql(a,b)=mrcb[(mrcb//dc-title="Energi*")]
     Note: if x or y can not be parsed correctly the whole result-set will be returned.

BTH-EAD (search index based on the EAD-dtd )

Search for dc-title
_xql=ead[(ead//dc-title="stad*")]

Count (delivers number of hits - not the hits themselves ! ):
_xql=count(ead[(ead//dc-title="stad*")])      --->  1 hits  

ULAN (search index based on the ulan-dtd )

Search for dc-title
_xql=ulan[(ulan//dc-title="hay*")]

Count (delivers number of hits - not the hits themselves ! ):
_xql=count(ulan[(ulan//dc-title="hay*")])      --->  3 hits  

AAT (search index based on the aat-dtd )

Search for dc-title
_xql=aat[(aat//dc-title="cult*")]

Count (delivers number of hits - not the hits themselves ! ):
_xql=count(aat[(aat//dc-title="cult*")])      --->  5 hits  

TGN (search index based on the tgn-dtd )

Search for dc-title
_xql=tgn[(tgn//dc-title="austria")]

Count (delivers number of hits - not the hits themselves ! ):
_xql=count(tgn[(tgn//dc-title="austria")])      --->  1 hits  

Error-Tests

Parsing-error :

quotes missing!
_xql=am_object[(am_object//AID__amico_identifier~=*10*)]

range parsing error!
_xql(-3,2)=am_object[(am_object//OTN__object_title_name~="Aus*")]

TextML-error:

Hence, if your browser can't show the error XML document (because of UTF-16 encoding) use view source!
_xql=am_object[(am_object//AID__wrong_amico_identifier~="*10*")]