<?import uri="..."?><?import uri="..." directives="..."?>

It imports the directives, such as component definitions (<?component?>) and initiators (<?init?>), defined in another ZUML page.

If the directives attribute is omitted, only the component and init directives are imported. If you want to import particular directives, you can specify a list of the names of the directives separated by comma. For example,

<?import uri="/template/taglibs.zul" directives="taglib, xel-method"?>

The directives that can be imported include component, init, meta, taglib, variable-resolver, and xel-method. If you want to import them all, specify * to the directives attribute. Notice that meta implies both the meta and link directives.

A typical use is that you put a set of component definitions in one ZUML page, and then import it in other ZUML pages, such that they share the same set of component definitions, additional to the system default.

<!-- special.zul: Common Definitions -->
<?init zscript="/WEB-INF/macros/special.zs"?>
<?component name="special" macroURI="/macros/special.zuml" class="Special"?>
<?component name="another" macroURI="/WEB-INF/macros/another.zuml"?>

where the Special class is assumed to be defined in /WEB-INF/macros/special.zs.

Then, other ZUML pages can share the same set of component definitions as follows.

<?import uri="special.zul"?>
...
<special/><!-- you can use the component defined in special.zul -->

Unlike other directives, the import directives must be at the topmost level, i.e., at the the same level as the root element.

For more information, refer to the Developer's Reference.