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(!)see
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NodeBuilder
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API
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concept
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page
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-
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Writing
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and
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maintaining
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update
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tasks
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is
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a
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error-prone
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and
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also
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boring
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task.
...
The
...
Problem
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The
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main
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problem
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is
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that
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we
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have
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to
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maintain
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the
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installation
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and
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update
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procedure
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separately.
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While
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we
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implicitly
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test
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the
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installation
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process
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we
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rarely
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do
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that
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for
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the
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update
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tasks.
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It
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is
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very
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easy:
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- to
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- forget
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- an
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- update
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- tasks
...
- write
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- them
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- wrongly
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- (based
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- on
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- wrong
...
- assumption)
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- write
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- them
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- not
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- fain
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- grained
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- enough
...
- because
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- it
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- is
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- time
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- consuming
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Potential
...
Solutions
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Use
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a
...
builder
...
API
...
It
...
is
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in
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general
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a
...
good
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idea
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to
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code
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deltas
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/
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initial
...
configuration
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by
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using
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a
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content
...
builder
...
API.
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see
...
...
A)
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Do
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not
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separate
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Installation
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/Update
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- write
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- the
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- initial
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- installation
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- process
...
- on
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- later
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- installations
...
- 1.0.3
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- execute
...
- the
...
- initial
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- installation
...
- and
...
- the
...
- deltas
...
- on
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- update
...
- simply
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- execute
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- the
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- deltas
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- (as
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- today)
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This
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works
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as
...
long
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the
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deltas
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are
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small
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enough.
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But
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there
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is
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a
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tricky
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thing
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to
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consider:
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that
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each
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module
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executes
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the
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complete
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chain
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and
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only
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then
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the
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next
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modules
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update
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tasks
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are
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executed.
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This
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can
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lead
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to
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unwanted
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side
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effects
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if
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one
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delta
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depends
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on
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a
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former
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state
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from
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an
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other
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module.
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B)
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Generate
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the
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delta
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code
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We
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could
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have
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a
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tool
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which
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can
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generate
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the
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update
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code
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(using
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the
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builder
...
API)
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based
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on
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either
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two
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repository
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states
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or
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two
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bootstrap
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files.
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- this
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- ensures
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- that
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- nothing
...
- gets
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- forgotten
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- tasks
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- are
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- fine
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- grained
...
- easier
...
- to
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- verify
it's
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- too
...
- easy
...
- to
...
- make
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- mistakes
...
- by
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- relying
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- too
...
- much
...
- on
...
- such
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- a
...
- tool
...
- (i.e.
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- the
...
- tool
...
- can't
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- know
...
- if
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- a
...
- property
...
- has
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- been
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- renamed
...
- ("template"
...
- /
...
- "templatePath")
...
- or
...
- dropped
...
- and
...
- another
...
- one
...
- was
...
- added
...
- (i.e
...
- if
...
- it
...
- should
...
- keep
...
- the
...
- value
...
- or
...
- not)
...
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