2018-6: What's Your Angle?

XML elements are denoted with content enclosed in beginning and ending tags. The tags themselves are enclosed in left and right angle brackets < and >. The only valid occurrences of angle brackets are as a part of beginning or ending tags.

For example, the following is valid

<name><first>Drake</first><last>Mallard</last></name>

Whereas the following is not valid XML

<math><relation>2<3</relation></math>

One easy validation is to check that the angle brackets are properly balanced – all left angle brackets < must be "closed" with right angle brackets > before another occurrence of a left angle bracket.

Write code that, given a character scalar or vector representing some XML, returns 1 if the angle brackets are properly balanced and 0 if not.