When you want to use Silex it is important to understand that there is a layer hierarchy.
 Some layers are called “parent layers” and some are called “children layers”.

We call parent layer, a layer from which one another layer had been created (its children layer).

If you want more details about layers you can look at the article “page creation”.

3 basics things:

* a parent layer can have several children layers

* a layer can be both parent and children layer

* all the components that are on a parent layer will be visible on stage from its children layer(s)

Illustration :

Here <start> is the parent layer of <template_import_pdf_first_page> and consequently, <template_import_pdf_first_page> is the children layer of <start>.

To know if a layer is parent or children layer or both, help you of layers order in the layers toolbox.

Example : in the illustration above, <start> is on top and has a layer under it, so it’s the parent layer of this layer.

The layer under <start> has no layer under it so it’s only a children-layer.

Look at this example :

Here <start> is the parent layer of <template_import_pdf_first_page>.

<template_import_pdf_first_page> is the children layer of <start> and it’s also the parent
layer of <detail>.

<detail> is only the children layer of <template_import_pdf_first_page>.

In that example we have what we call different level of depth. <Start> corresponds to the level 0, <template_import_pdf_first_page” to the level 1 and <detail> to the level 2.

Note : you can have as many levels as you want

It implies this :

▪ <start> corresponds to the level 0 = all the elements that are on this layer would be find on all the pages and sub-pages of your publication.

▪ <template_import_pdf_first_page> corresponds to the level 1 = the elements that you will find here are those that you would put on this layer + those that are on the <start> layer

▪ <detail> corresponds to the level 2 : the elements that you will find here are those that you would put on this layer + those that are on the <start> layer + those that are on the <template_import_pdf_first_page> layer.

Note 1 : to resume, a children layer inherit of its parent layer’s content.

Note 2 : if a layer has several children layers, you won’t see them at the same time in the layers toolbox.

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