Some commands require data of certain types. In cases where data is of the wrong type, a conversion (also known as "casting") is attempted. For example, <:include_file param> requires an FSSP for the parameter. If the parameter is some other kinds of data, such as text, Flex-Able will attempt to convert the text into an FSSP by interpreting it as a file path.

• TEXT
  Most data in Flex-Able is text data. Almost any other kind of data can be converted to text.
  <:sizeof x> returns the number of characters in the text
• INTG
  Integer data - nubers in the range of +/- 2.1 billion. Can be cast to/from text freely.
  <:sizeof x> returns 1
• FSSP
  File specification. When TEXT is cast to FSSP, the text is interpreted as a file path. You CAN NOT create an FSSP that points outside of the virtual host of the current request.
  eg: <:new "FSSP" "/file1"> creates an FSSP that points to the file "file1" located in the root of the current virtual host.
  When echoed, an FSSP will only return the filename of that file. We plan to provide a separate command to obtain document URIs.
  <:sizeof x> returns 0 - it should probably return the filename length
• ASOC
  Associative Array. This is a complex data type that can contain other kinds of data, including other ASOCs. Each item is indexed by name. Hence myVar["item 1"] returns the data labeled "item 1". When addressing a member of an ASOC, the index is cast to type TEXT.
  When echoed, an ASOC will return a comma-separated list enclosed with {braces}. To get each item of an ASOC separately, use the <:foreach> command.
  <:sizeof x> returns the number of items in the array
• LIST
  Ordered List. This is another complex data type that can contain other kinds of data, including other LISTs. Each item is indexed by number, with zero as the base index. Hence myVar[1] returns the second member. When addressing a member of a LIST, the index is cast to type INTG.
  When echoed, an LIST will return a comma-separated list enclosed with (parenthesis). To get each item of a LIST separately, use the <:foreach> command.
  <:sizeof x> returns the number of items in the LIST