Functions
- boolean()
- ceiling()
- concat()
- contains()
- count()
- current() XSLT 고유
- document() XSLT 고유
- element-available()
- false()
- floor()
- format-number() XSLT 고유
- function-available()
- generate-id() XSLT 고유
- id() (부분 지원함)
- key() XSLT 고유
- lang()
- last()
- local-name()
- name()
- namespace-uri()
- normalize-space()
- not()
- number()
- position()
- round()
- starts-with()
- string()
- string-length()
- substring()
- substring-after()
- substring-before()
- sum()
- system-property() XSLT 고유
- translate()
- true()
- unparsed-entity-url() XSLT 고유 (지원 안 함)