Help with using parameters in included Xacro Macro

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Hello all,

I'm trying to do something that I think is very basic but running into all kinds of trouble. System is Ubuntu 16.04 with ROS Kinetic. I want to define my robot (a drone) with the following file: sample_drone.urdf.xacro

<?xml version="1.0"?>

<robot name="test_drone" xmlns:xacro="http://ros.org/wiki/xacro">
    <!-- Load up the base pieces -->
    <xacro:include filename="xacro_modules/base_link.xacro"/>
    <xacro:include filename="xacro_modules/fiveinch_chasis.xacro"/>
    <!-- Right now just testing having a camera -->
    <xacro:include filename="xacro_modules/orbbec_astra.xacro"/>
    <xacro:orbbec_astra parent="five_inch_chasis" x="0.15" y="0.0" side="1.0"/>
</robot>

And for reference, the astra file looks like: orbbec_astra.xacro:

<?xml version="1.0"?>
<xacro:macro name="orbbec_astra" params="parent x y side">
    <!-- Actual link -->
    <link name="orbbec_astra">
        <visual>
            <geometry>
                <!-- TODO: replace with the actual mesh here -->
                <box size="0.083  0.058  0.020"/>
            </geometry>
            <origin xyz="0 0 0" rpy="0 0 0"/>
        </visual>
        <collision>
            <geometry>
                <box size="0.083  0.058  0.020"/>
            </geometry>
            <origin xyz="0 0 0" rpy="0 0 0"/>
        </collision>
        <inertial>
            <mass value="0.038"/>
            <inertia ixx="1.0" ixy="0.0" ixz="0.0" iyy="1.0" iyz="0.0" izz="1.0" />
        </inertial>
    </link>
    <!-- Connecting Joint -->
    <joint name="${parent}_to_astra" type="fixed">
        <parent link="${parent}"/>
        <child link="orbbec_astra"/>
        <origin xyz="${x} ${y} ${ (0.01 + (drone_thickness/2.0) )*side}" rpy="${ (side-1)*(pi/2.0) } 0 0"/>
    </joint>
</xacro:macro>

I've tried several different tweaks to this, but everything seems to run into some kind of error. Is there any way I can include the orbbec_astra.xacro without having it automatically expand (and thus fail because it has no parameters) and then call the macro with the required parameters?

Edit: For more clarification, I am running

rosrun xacro xacro.py sample_drone.urdf.xacro > sample_drone.urdf

With the code I've shown above, I get the following errors:

xacro: Traditional processing is deprecated. Switch to --inorder processing!
To check for compatibility of your document, use option --check-order.
For more infos, see http://wiki.ros.org/xacro#Processing_Order
name 'parent' is not defined
when evaluating expression 'parent'
when processing file: sample_drone.urdf.xacro

Which makes sense, because it seems to try expanding the astra macro completely.

Now if I remove the line

<xacro:orbbec_astra parent="five_inch_chasis" x="0.15" y="0.0" side="1.0"/>

from the top-level file and instead try to pass parameters to the include such as like:

<xacro:include filename="xacro_modules/orbbec_astra.xacro" parent="five_inch_chasis"/>

I get errors that parent is not a known parameter (makes sense, that's not what xacro knows about).

Edit: [Answer]: Including the robot tag in the astra macro has resolved the issue.