Define new IF query comparator special character sets based on XML special characters.

Test operators such as '<', '>', '<=', '>=' and '<>' conflict with property query evaluation which use the following tags: '<r:' and '>'

Therefore, in addition to the existing standard operator characters, it will need to be possible to use special character aliases based on existing XML aliases.

< : &lt&

> : &gt&

<= : &ltoret&

>= : &gtoret&

<> : &dift&

NOTE: Operator strings are case sensitive; they must be used in lowercase.