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Single vs Double Quotations

Generally XPath expressions values in display or calculation conditions will be surrounded by inside quotes IE
<bind nodeset="/data/name" />
However literal values would also be surrounded by single quotes:
<bind nodeset="/data/name" calculate="'will pride'" />

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You can use single quotes or double quotes, both work fine.

Spaces

Spaces generally will not matter (i.e. Will be ignored) unless they are themselves in a string literal

References

xform details: http://dimagi.github.io/xform-spec/#xpath-pathsinside quotes.