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Some simple examples of embedded semantic tree. Note that for readability the attributes have been abbreviated
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Original MathML:
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```html
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<math>
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<mi>a</mi>
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<mo>+</mo>
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<mi>b</mi>
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<mo>+</mo>
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<mi>c</mi>
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</math>
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```
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Semantic Tree:
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```html
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<stree>
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<infixop role="addition" id="5">
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+
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<content>
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<operator role="addition" id="1">+</operator>
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<operator role="addition" id="3">+</operator>
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</content>
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<children>
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<identifier role="latinletter" font="italic" id="0">a</identifier>
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<identifier role="latinletter" font="italic" id="2">b</identifier>
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<identifier role="latinletter" font="italic" id="4">c</identifier>
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</children>
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</infixop>
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</stree>
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```
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Semantically enriched MathML:
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```html
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<math>
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<mrow semantic-type="infixop" semantic-role="addition" id="5" semantic-content="1,3" semantic-children="0,2,4">
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<mi semantic-type="identifier" semantic-role="latinletter" id="0" semantic-parent="0">a</mi>
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<mo semantic-type="operator" semantic-role="addition" id="1" semantic-operator="infixop,+" semantic-parent="1">+</mo>
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<mi semantic-type="identifier" semantic-role="latinletter" id="2" semantic-parent="2">b</mi>
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<mo semantic-type="operator" semantic-role="addition" id="3" semantic-operator="infixop,+" semantic-parent="3">+</mo>
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<mi semantic-type="identifier" semantic-role="latinletter" id="4" semantic-parent="4">c</mi>
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</mrow>
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</math>
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```
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Original MathML:
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```html
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<math>
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| ... | ... | |
