Source files for examples in Chapter 6 of the LaTeX Graphics Companion catalog catalog file for nsgmls xml.dcl SGML declaration for XML spec invitation.xml XML source introduced in Section 6.4.2.2 invitation.dtd DTD source introduced in Section 6.4.3 emptyexample.xml XML source introduced in Section 6.5.5 wrong.xml XML source introduced in Section 6.6.5.5 Important remark: To run the examples with nsgmls, you should first set the environment variable SGML_CATALOG_FILES to the value catalog, for instance in the Bourne shell SGML_CATALOG_FILES=catalog export SGML_CATALOG_FILES or in the C shell setenv SGML_CATALOG_FILES catalog Then you can type (if you have installed nsgmls) nsgmls invitation.xml