How to update texts of a svg element with textboxes ?

I have created a shape with different paths, and added texts to each path, but now i want to get these texts in textboxes and update them , can anyone help me , how to do this plz ?

here is the code:

<svg width="640" height="480" xmlns="http://www.w3.org/2000/svg">

<!-- Created with SVG-edit - http://svg-edit.googlecode.com/ -->

<g>

<title>Layer 1</title>

<g id="svg_1">

<path fill="#FFFFFF" stroke="#000000" stroke-width="5" stroke-dasharray="null" stroke-linejoin="null" stroke-linecap="null" d="m163.2
9622,116.65482l174.433,0l0,54.00005l-174.433,0l0,-54.00005z" id="svg_12"/>

<path fill="#FFFFFF" stroke="#000000" stroke-width="5" stroke-dasharray="null" stroke-linejoin="null" stroke-linecap="null" d="m163.78255,171.49857l174.433,0l0,54.00006l-174.433,0l0,-54.00006z" id="svg_15"/>

<path fill="#FFFFFF" stroke="#000000" stroke-width="5" stroke-dasharray="null" stroke-linejoin="null" stroke-linecap="null" d="m163.78255,226.49857l174.433,0l0,54.00006l-174.433,0l0,-54.00006z" id="svg_16"/>

<text fill="#000000" stroke="#
000000" stroke-width="0" stroke-dasharray="null" stroke-linejoin="null" stroke-linecap="null" x="239" y="151" id="svg_17" font-size="24" font-family="serif" text-anchor="middle" xml:space="preserve">Class</text>

<text fill="#000000" stroke="#000000" stroke-width="0" stroke-dasharray="null" stroke-linejoin="null" stroke-linecap="null" x="243.98828" y="205.5" font-size="24" font-family="serif" text-anchor="middle" xml:space="preserve" id="svg_18">Attr</text>

<text fill="#0000
00" stroke="#000000" stroke-width="0" stroke-dasharray="null" stroke-linejoin="null" stroke-linecap="null" x="242.98828" y="261.5" font-size="24" font-family="serif" text-anchor="middle" xml:space="preserve" id="svg_19">func</text>

</g>

</g>

</svg>

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