Sets the search filter (facets, or other). The filter values must obey the predicate grammar.
For more information, see Other Parameters.
Optional. It may be set several times (in which case all filters are evaluated in an "and" fashion).
The available operators are: and, not and or (must be in lower case).
afs:filter=a>b&afs:filter=c<d is equivalent to afs:filter=(a>b)and(c<d)
afs:filter=myFilter=[1 .. 9] is equivalent to afs:filter=myFilter>=1 & afs:filter=myFilter <=9 and is also equivalent to afs:filter=myFilter>=1 and myFilter <=9
afs:filter=(category=a or category=b)will show the results of the union of facets category a and category b.
afs:filter=not(category=a) will hide results with a value a for facet category.
afs:filter=date="2012-12-12" will show results for this day.
afs:filter=date=["2012-12-12" .. "2012-12-21"[ will show results for this interval.
afs:filter=date="2012-01" is equivalent to afs:filter=date=["2012-01-01" .. "2012-02-01"[ and will show result only for this month.