htp on-line reference : WHILE

syntax

<WHILE [NOT] conditional>
    block
</WHILE>



synopsis

"Conditional" is either a "compare" or "is defined" operation. A compare operator is a test of the value of a macro against a literal string. If the NOT tag is present in the WHILE markup, the evaluation of the conditional is reversed:

  <WHILE NOT i="10">
    ...
    <INC i>
  </WHILE>


Just as with IF you can also check for a macro's existance:

  <WHILE sect-$i>
    ...
    <INC i>
  </WHILE>


If the condition is true, the block is evaluated and afterwards the WHILE tag is evaluated again. If the '$'-operator is used in the WHILE tag it is also reevaluated on each iteration.

A loop block must be closed with the /WHILE tag.