.skp - SketchUp document file
.pages - iWork Pages document file
.wps - Microsoft Works document
.xls - Microsoft Office Excel spreadsheet
.odt - OpenOffice.org Writer text document
.pub - Microsoft Publisher document
.pps - Microsoft PowerPoint slideshow
.epub - Open Publication structure eBook
file extension SGM - Encoded archival description document
File extension SGM description:
EAD DTD is designed to function as both an SGML and XML DTD. It conforms to all SGML/XML (ISO 8879) specifications. It has been thoroughly tested using a wide variety of existing SGML/XML software. To be used as an XML DTD, "switches" have been included in the DTD for turning off features used only in SGML applications, and turning on features used in XML applications. Instructions for using these "switches" are contained in the DTD itself. Please keep in mind, downloading the EAD DTD and related files is not all you will need to do to begin using it. Most SGML and XML authoring software requires more than simply loading a new DTD to make them work since there are often proprietary features and add-ons to contend with. You will most likely need to consult manuals or user guides on your SGML/XML software after getting a copy of the EAD DTD and related files themselves.