<XTutorial id="11" next="12" previous="10">
<description lang='eng'>Processing instructions (PIs) allow documents to contain instructions for applications. </description>
<!-- <description lang='cze'>Programové instrukce (PI) umo?ňují p?edávat aplikaci r?zné instrukce.</description> -->
<demo type="wf">
<description lang='eng'>Processing instructions </description>
<!-- <description lang='cze'>PI</description> -->
<doc>
{example}
{?perl lower-to-upper-case  ?}
{?web-server add-header = "university" ?}
{text}vscht{/text}
{/example}
</doc>

</demo>

<demo type="notwf">
<description lang='eng'>Processing instruction must end with ?></description>
<!-- <description lang='cze'>PI musí kon?it s ?></description> -->
<doc>
{example}
{?perl run <error>_</error>}

{/example}
</doc>

</demo>

</XTutorial>