Camelcase

Write element and attribute names in a style called "CamelCase." Elements reflecting an entity should be written in UpperCamelCase; elements and attributes reflecting a property should be written in lowerCamelCase.

It's common practice to name private members in camelCase, that is with an initial lower case letter and a capital for the start of each word.

CamelCase is a common way of writing variable names in programming. It allows the programmer or someone reading their code to easily parse long variable names. […] The key feature of camelCase is that it allows multiple words to be combined into one with a medial capital letter at the beginning of each original word. It is named camelCase because it looks a bit like the humps on a camel's back.