What is the significance of these extra fields like
es?
es significa que ipAddress vem do formulário FRED.99.88.xsd XML Schema - veja a definição de espaço de nomes xmlns:es="FRED.99.88.xsd" (um dos atributos da tag raiz bulkCmConfigDataFile ).
I assume this brackets this particular object (the ipAddress value, 123 Westbrook), but what part of the path is actually given to XMLStarlet?
De acordo com a documentação do XMLStarlet :
sel (or select) - Select data or query XML document(s) (XPATH, etc)
e depois de xmlstarlet sel --help :
XMLStarlet Toolkit: Select from XML document(s)
Usage: xmlstarlet sel <global-options> {<template>} [ <xml-file> ... ]
where
<global-options> - global options for selecting
<xml-file> - input XML document file name/uri (stdin is used if missing)
<template> - template for querying XML document with following syntax:
<global-options> are:
-Q or --quiet - do not write anything to standard output.
-C or --comp - display generated XSLT
-R or --root - print root element <xsl-select>
-T or --text - output is text (default is XML)
-I or --indent - indent output
-D or --xml-decl - do not omit xml declaration line
-B or --noblanks - remove insignificant spaces from XML tree
-E or --encode <encoding> - output in the given encoding (utf-8, unicode...)
-N <name>=<value> - predefine namespaces (name without 'xmlns:')
ex: xsql=urn:oracle-xsql
Multiple -N options are allowed.
--net - allow fetch DTDs or entities over network
--help - display help
Syntax for templates: -t|--template <options>
where <options>
-c or --copy-of <xpath> - print copy of XPATH expression
-v or --value-of <xpath> - print value of XPATH expression
-o or --output <string> - output string literal
-n or --nl - print new line
-f or --inp-name - print input file name (or URL)
-m or --match <xpath> - match XPATH expression
--var <name> <value> --break or
--var <name>=<value> - declare a variable (referenced by $name)
-i or --if <test-xpath> - check condition <xsl:if test="test-xpath">
--elif <test-xpath> - check condition if previous conditions failed
--else - check if previous conditions failed
-e or --elem <name> - print out element <xsl:element name="name">
-a or --attr <name> - add attribute <xsl:attribute name="name">
-b or --break - break nesting
-s or --sort op xpath - sort in order (used after -m) where
op is X:Y:Z,
X is A - for order="ascending"
X is D - for order="descending"
Y is N - for data-type="numeric"
Y is T - for data-type="text"
Z is U - for case-order="upper-first"
Z is L - for case-order="lower-first"
...
Você pode usar o XPath para selecionar o elemento do arquivo XML aqui.
Which should point to the value 123_Westbrook? Insert slashes? Something else?
Como sua pergunta parece ser uma lição de casa para mim, eu só lhe dou: