The APEX_PRINT package uses the following constants.

Template Type Constants

subtype t_template_type is pls_integer range 1..10;

c_template_docx     constant t_template_type := 1;
c_template_xlsx     constant t_template_type := 2;
c_template_pptx     constant t_template_type := 3;
c_template_html     constant t_template_type := 4;
c_template_markdown constant t_template_type := 5;
c_template_csv      constant t_template_type := 6;
c_template_txt      constant t_template_type := 7;
c_template_ods      constant t_template_type := 8;
c_template_odt      constant t_template_type := 9;
c_template_odp      constant t_template_type := 10; 

Output Type Constants

subtype t_output_type is pls_integer range 1..11;

c_output_pdf        constant t_output_type := 1;
c_output_docx       constant t_output_type := 2;
c_output_xlsx       constant t_output_type := 3;
c_output_pptx       constant t_output_type := 5;
c_output_html       constant t_output_type := 4;
c_output_markdown   constant t_output_type := 6;
c_output_csv        constant t_output_type := 7;
c_output_txt        constant t_output_type := 8;
c_output_odt        constant t_output_type := 9;
c_output_ods        constant t_output_type := 10;
c_output_odp        constant t_output_type := 11;