doc/tutorial/basics: various improvements
- added section for templates
- updated ambiguity in bottom.md
- several small fixes
Change-Id: Iac03e7b99eec1ea352cb30d815a8cfbfb6896b18
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+[TOC](Readme.md) [Prev](lists.md) [Next](instances.md)
+
+_Types ~~and~~ are Values_
+
+# Templates
+
+One of CUE's most powerful features is templates.
+A template defines a value to be unified which each field of a struct.
+
+The template's identifier (in angular brackets) is bound to name of each
+of its sibling fields and is visible within the template value
+that is unified with each of the siblings.
+
+```
+// The following struct is unified with all elements in job.
+// The name of each element is bound to Name and visible in the struct.
+job <Name>: {
+ name: Name
+ replicas: 1 | uint
+ command: string
+}
+
+job list command: "ls"
+
+job nginx: {
+ command: "nginx"
+ replicas: 2
+}
+```
+
+```
+job: {
+ list: {
+ name: "list"
+ replicas: 1
+ command: "ls"
+ }
+ nginx: {
+ name: "nginx"
+ replicas: 2
+ command: "nginx"
+ }
+}
+```
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