Reference material that can help you. If you have additional suggestions, please let me know.
 
CSS-1.0.pdf
Quick-Reference for CSS 1.0 da DeepX
CSS2.PDF
Quick-Reference for CSS 2.0 da DeepX
XML Schema Part 0- Primer.html
The official document from W3C that presents XML Schema in a less formal and more accessible way than the specification.
SchemaDataTypesQR-2.pdf
Quick-reference for XML Schema data types from D Vint
SchemaStructuresQR-2.pdf
The equivalent quick reference for the model part of XML Schema. from D Vint
XSD1-1.0.pdf
Quick-Reference about XML Schema - Structures - from DeepX
XSD2-1.0.pdf
Quick-Reference about XML Schema - Data Types - from DeepX
XPath Visualiser.zip
You can use the IE to evaluate Xpath Queries.
XPath-1.0.pdf
Quick-Reference sobre XPath 1.0 da DeepX
xpe.jar
Quick-Reference for XPath 1.0 from DeepX
XSLT-1.0.pdf
Quick-Reference about XSLT 1.0 from DeepX
XSL-1.0.pdf
Quick-Reference about XSL:FO from DeepX
eXist-PhP.zip
API PHP for the eXist