This is a test file with title "This is an alternative title". The first section is called "Introduction" and has number "1".

The body section of this text is as follows.

body { h1 @id[doctitle][This is an alternative title] section @id[sec1] { title @id[introtitle] [Introduction] p [This is a test file with title "[copy[doctitle]]". The first section is called "[copy[introtitle-title]]" and has number "[copy[introtitle-number]]".] p [The body section of this text is as follows.] pre [ ... ] }; section section @id[newsec] { title @id[newsectitle] [Theorems on conservation of mass-energy] p [In this section we will consider the following theorem.] theorem @id[einstein] @name[Einstein's theorem] math E = m c sup 2 p [This famous [copy[einstein-type]], [copy[einstein-name]], has number [copy[einstein-number]].] p [This principle of Einstein's replaced the older [copy[cons-type]], [copy[cons-name]], which I have called number [copy[cons-number]].] theorem @id[cons] @name[The Conservation of Energy and Mass] @number[0] p [[math E = E] and [math m = m].] }; section }; body

In this section we will consider the following theorem.

**Theorem 2.1**** (Einstein's theorem)**

This famous Theorem, Einstein's theorem, has number 2.1.

This principle of Einstein's replaced the older Theorem, The Conservation of Energy and Mass, which I have called number 0.

**Theorem 0**** (The Conservation of Energy and Mass)**

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