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Contents 1 New simple steps and compound steps 1.1 Sorting 1.2 Validation with error 1.3 Map-reduce 1.4 Iterate until condition 1.5 Dynamic pipeline execution 1.6 Long-form viewport 1.7 e-mail

New simple steps and compound steps

Someone should work through http://exproc.org/proposed/steps/ and make entries below. Someone should work through http://xmlcalabash.com/docs/reference/ looking at extension steps and making entries below

Sorting

Should we have a p:sort? What would it look like?

• xsl:sort provides one possible model -- how much would we use?

Validation with error

Is there a way to have validation not require try-catch to access error messages? So that we could stream validation?

• Try-catch can't be streamed, because if there is an error, however late in the day, there is no output on the primary output. . .

Map-reduce

Some kind of support for scatter-gather/map-reduce/whatever you like to call it

• Does this need anything we don't have already

Iterate until condition

Repeat a step/group? until some XPath expression is satisfied, feeding its output back as its input after the first go-around

• Special built-in support for iterate to fixed-point?
• Reference xsl:iterate
• iterate-to-fixed-point already implemented as an extension step in Calabash: ex:until-unchanged

Dynamic pipeline execution

Run a pipeline whose XML representation is input

Long-form viewport

With an intrinsic switch built-in

e-mail

A step(s) to handle SMTP and sending e-mail messages.