Iterate over YAML tree and extract elements when converting to another format (e.g. DOCX or PDF)

[Brendan Pearl <talikarng-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Is it possible to iterate over a YAML file containing the elements I want 
converted into another format?

Here is a snippet of my current YAML structure (it is in YAML so that I can 
use it in other ways later - such as with R)

---
Items:
  "@Kamieniecki_Prevalencepsychologicaldistress_2001":
    Focus:  "Prevalence of psychological distress or disorders in young 
people who are homeless in Australia"
    Number of studies:  14
    Reported findings:  "Young people who are homeless have high rates of 
psychological disorders and score higher on tests of psychological distress"
    Reference: "@Kamieniecki_Prevalencepsychologicaldistress_2001"
    Tags:
      - negative_outcomes
      - mental_health

  "@EmbletonMwangiEtAl_epidemiologysubstanceuse_2013":
    Focus: "Prevalence of lifetime substance use in children living on the 
street in 'resource constrained settings'"
    Number of studies: 50
    Reported findings: "Pooled prevalence estimate of 60% [95% CI: 51-69%]"
    Reference: "@EmbletonMwangiEtAl_epidemiologysubstanceuse_2013"
    Tags:
      - negative_outcomes
      - substance_use
...

Is it possible to get pandoc (or a pandoc filter) to iterate over each of 
the items and extract specific elements (perhaps even conditionally - e.g. 
only those with certain tags)?

Brendan.

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