is a <@>:element:{chemical element} with <@>:chemsym:{chemical symbol} <chemsym> and <@>:atomnum:{atomic number} <atomnum>. <p> In <@>:purity:pure form, it is a highly <@>:react:reactive <@>:metal:{metal}, but normally a thin coat of <@>:aloxide:{aluminium oxide} forms on its surface, keeping it highly <@>:stab:{stable}. <p> In nature, it occurs as the <@>:ion:ion <$>:{Al^{3+}}. It constitutes 8.2% of the earth's crust, making it the most common <@>:metal:metal found there. ... };

# Example of an article written in UDL.


title: Aluminium;
shortdesc: The <@>:element:{chemical element} aluminium.;
uuid: 0c5aacfe-d828-43c7-a530-12a802af1df4;
type: chemical-element;
tags: [metal; common];
key: aluminium;

chemical-symbol: Al;
atomic-number: 13;
stp-phase: solid;
melting-point: 933.47;
boiling-point: 2743;
density: 2.7;
electron-shells: [2; 8; 3];

# External references
ext-refs: {
  wikipedia: "https://en.wikipedia.org/wiki/Aluminium";
  snl: "https://snl.no/aluminium";
};

# Intra-wiki references
refs: {
  element: 740097ea-10fa-4203-b086-58632f099167;
  chemsym: 6e2f634c-f180-407a-b9ce-2138b412b248;
  atomnum: 1a5e1974-a78c-4820-afeb-79bef6974814;
  react: ab7d8a1f-c028-4466-9bb2-41a39d153241;
  aloxide: c1ff08e7-a88f-42d5-83c3-6adc4835a07b;
  stab: b3b13474-4fe3-4556-9568-925c066916a5;
  purity: 40786551-85c4-461c-ba6e-4d54d5863820;
  ion: effd5c7a-da31-4357-a94c-91343e9a05eb;
  metal: 84333088-cfcc-4e78-8d3f-7307dcab144b;
};

content: {

  <@>:self:<title> is a <@>:element:{chemical element} with
  <@>:chemsym:{chemical symbol} <chemsym> and <@>:atomnum:{atomic number}
  <atomnum>.

  <p>

  In <@>:purity:pure form, it is a highly <@>:react:reactive <@>:metal:{metal},
  but normally a thin coat of <@>:aloxide:{aluminium oxide} forms on its
  surface, keeping it highly <@>:stab:{stable}.

  <p>

  In nature, it occurs as the <@>:ion:ion <$>:{Al^{3+}}. It constitutes 8.2%
  of the earth's crust, making it the most common <@>:metal:metal found there.

  ...

};