+-- synchronization* []
       +-- svec
       |  +-- relaxable?      boolean
       |  +-- disjointness?   te-path-disjointness
       |  +-- request-id*     uint32
       +-- svec-constraints
       |  +-- path-metric-bound* [metric-type]
       |     +-- metric-type    identityref
       |     +-- upper-bound?   uint64
       +-- path-srlgs-lists
       |  +-- path-srlgs-list* [usage]
       |     +-- usage     identityref
       |     +-- values*   srlg
       +-- path-srlgs-names
       |  +-- path-srlgs-name* [usage]
       |     +-- usage    identityref
       |     +-- names*   string
       +-- exclude-objects
       |  +-- excludes* []
       |     +-- (type)?
       |        +--:(numbered-node-hop)
       |        |  +-- numbered-node-hop
       |        |     +-- node-id     te-node-id
       |        |     +-- hop-type?   te-hop-type
       |        +--:(numbered-link-hop)
       |        |  +-- numbered-link-hop
       |        |     +-- link-tp-id    te-tp-id
       |        |     +-- hop-type?     te-hop-type
       |        |     +-- direction?    te-link-direction
       |        +--:(unnumbered-link-hop)
       |        |  +-- unnumbered-link-hop
       |        |     +-- link-tp-id    te-tp-id
       |        |     +-- node-id       te-node-id
       |        |     +-- hop-type?     te-hop-type
       |        |     +-- direction?    te-link-direction
       |        +--:(as-number)
       |        |  +-- as-number-hop
       |        |     +-- as-number    inet:as-number
       |        |     +-- hop-type?    te-hop-type
       |        +--:(label)
       |           +-- label-hop
       |              +-- te-label
       |                 ...
       +-- optimizations
          +-- (algorithm)?
             +--:(metric) {te-types:path-optimization-metric}?
             |  +-- optimization-metric* [metric-type]
             |     +-- metric-type    identityref
             |     +-- weight?        uint8
             +--:(objective-function)
                      {te-types:path-optimization-objective-function}?
                +-- objective-function
                   +-- objective-function-type?   identityref