2 Structure of a stanza:
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7 tags -- array of tags
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9 --- static methods ---
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12 --- read-only methods ---
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13 reply -- return new stanza with attributes of current stanza
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14 child_with_name(string name) -- return the first child of the current tag with the matching name
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16 --- write methods ---
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17 tag(name, sttrs) -- create a new child of the current tag, and set the child as current
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18 up() -- move to the parent of the current tag
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19 text(string) -- append a new text node to the current tag
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