Finding lessons by their tags

A teacher wants every lesson on fractions. Meet the Unit Fractions is tagged only with Unit fractions; nobody tagged it Fractions.

Tools built on content-sdk can find lessons by their tags: those with a term, with any of several terms, with none of them, with no tags at all, or with a term or anything under it. Under Fractions finds Unit fractions too, because Unit fractions sits under Fractions.

Try it: choose Under Fractions, then Grade 6 or Grade 7, then No grade yet.

The lessons, found by their tags, as editors see them

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Lessons tagged with Fractions, or with anything under it

Lesson	Grades	Strands	Status
Adding Fractions with Like Denominators	Grade 4, Grade 5	Math › Fractions › Adding fractions	Published
Comparing Fractions	Grade 4	Math › Fractions › Comparing fractions	Published
Equivalent Fractions with Fraction Strips	Grade 3, Grade 4	Math › Fractions › Equivalent fractions	Published
Fractions on a Number Line	Grade 3	Math › Fractions › Unit fractions › Unit fractions on a number line	Not published
Halving a Recipe	Grade 5	Math › Fractions › Multiplying fractions	Published
Meet the Unit Fractions	Grade 3	Math › Fractions › Unit fractions	Published

Six of the 14 lessons are tagged with Fractions, or with anything under it. None is tagged Fractions itself: each has a strand under it, such as Unit fractions.

From the sample curriculum

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Find the lessons tagged with Fractions, or with anything under it197 ms

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So tag with the most exact strand that fits: the lesson is still found under every term above it. The same questions work on what readers see, which finds published lessons only, and across several types of content at once, where their fields share a vocabulary.