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           SECTION 5.3                                                                     Text Objects




                                      TABLE 5.4 Text object operators
OPERANDS      OPERATOR     DESCRIPTION

—             BT           Begin a text object, initializing the text matrix, Tm , and the text line matrix, Tlm , to
                           the identity matrix. Text objects cannot be nested; a second BT cannot appear before
                           an ET.

—             ET           End a text object, discarding the text matrix.

           These specific categories of text-related operators can appear in a text object:

           • Text state operators, described in Section 5.2, “Text State Parameters and Oper-
             ators”
           • Text-positioning operators, described in Section 5.3.1, “Text-Positioning Opera-
             tors”
           • Text-showing operators, described in Section 5.3.2, “Text-Showing Operators”
           The latter two sections also provide further details about the text object parame-
           ters described above. The other operators that can appear in a text object are
           those related to the general graphics state, color, and marked content, as shown in
           Figure 4.1 on page 197.

           Note: If a content stream does not contain any text, the Text procedure set may be
           omitted (see Section 10.1, “Procedure Sets”). In those circumstances, no text opera-
           tors (including operators that merely set the text state) may be present in the content
           stream, since those operators are defined in the same procedure set.

           Note: Although text objects cannot be statically nested, text might be shown using a
           Type 3 font whose glyph descriptions include any graphics objects, including another
           text object. Likewise, the current color might be a tiling pattern whose pattern cell
           includes a text object.

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