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How can I add a block through XML layout file, and not programaticaly, through controller?

I have my block and I want to use it in a template that already exists (catalog/category/view.phtml).

How can I do this without going in and changing a controller, and without changing the catalog/category/view.phtml directly?

I want to add this block somewhere in an already existing template through XML, and not programatically.

This is part of my block:

class Mynamespace_Mymodule_Block_Myblock extends Mage_Core_Block_Template

{

    public function _construct()

    {

        $this -> setTemplate("mynamespace_mymodule/myblock.phtml");

        return parent::_construct();



    }



    public function getItemsByCategoryAndUseState($category, $use_state) {

        return "some used or new items";

    }

}

This is config.xml of my module:

<config>

<modules>

    <Mynamespace_Mymodule>

        <version>3.0.0.1</version>

    </Mynamespace_Mymodule>

</modules>

<global>

    <blocks>

        <mynamespace_mymodule>

            <class>Mynamespace_Mymodule_Block</class>

        </mynamespace_mymodule>

    </blocks>

</global>

<frontend>

    <layout>

        <updates>

            <mynamespace_mymodule>

                <file>mynamespace_mymodule.xml</file>

            </mynamespace_mymodule>

        </updates>

    </layout>



</frontend>

This is my package/theme/layout/mynamespace_mymodule.xml:

<layout version="0.1.0">

    <catalog_category_view> 

        <reference name="product_list"> 

            <block type="mynamespace_mymodule/myblock" name="myblock" after="-" /> 

        </reference> 

    </catalog_category_view>

</layout> 

Thanks.

you can add block with this xml code

<catalog_category_view>

    <reference name="content">

        <block type="mymodule/myblock"  after="-" />

     </reference>

</catalog_category_view>

add this is <frontend> tag not in <global>

     <frontend>

      <layout>

        <updates>

            <mynamespace_mymodule>

                <file>mynamespace_mymodule.xml</file>

            </mynamespace_mymodule>

        </updates>

      </layout>

    </frontend>

Solved it partially by using methods of the block in template. I just:

1. Created the block


2. Declared the block in module's config.xml


3. Using it in the template (a .phtml file) like so:



4. echo $this -> getLayout() 
   
       -> createBlock('mymodule/myblock') 
   
       -> toHtml();
   
   

I want to do it just with .XML layout updates though.